We are truly saddened to hear about the serious health condition of your friend in Colombia. Before we begin, we must address a few things.
First, it is unclear if you are both believers in Jesus Christ. It is important to clarify that we only have access to God through Jesus Christ. There is no other name by which you can be saved. See what the Bible says in John 14:6 WEB Jesus said to him, I am the way, the truth, and the life. No one comes to the Father, except through me.
Second, we also want to discuss the nature of your relationship. The Bible teaches that relationships between men and women should be directed towards godly marriage. We encourage you to prayerfully consider this path if you haven't already. Being a boyfriend or girlfriend should be considered courtship with the goal being marriage to another Christian Believer.
Now, let us pray for her healing. Father in heaven, we come before you in the name of Jesus Christ to lift up Your daughter. We ask for Your healing touch on her body, specifically her digestive system. We rebuke the spirit of infirmity causing the toxic megacolon, and we command it to leave in Jesus' name. We pray for her complete recovery and restoration to full health. We also pray for Your guidance and wisdom for the doctors treating her, that they would have the knowledge and understanding to provide the best care.
We encourage you to trust in God's promise of healing. Exodus 15:26 WEB For I am Yahweh who heals you. Also, pray for her healing with confidence. James 5:15 WEB The prayer of faith will save him who is sick, and the Lord will raise him up. If he has committed sins, he will be forgiven.
Lastly, we encourage you to seek God's will in your relationship. Trust in Him to guide your path.
Psalm 32:8 WEB I will instruct you and teach you in the way which you shall go. I will counsel you with my eye on you.
Remember, God is faithful and He cares for you both. Trust in Him, and He will direct your paths.
Yeah, we're both believers in Him, though when we first met she was more of a "cultural Catholic" with a very basic but uninformed faith (i.e., she believed Jesus is real but had almost no Biblical knowledge), and I was going through a phase of being misotheistic after many years of having a good, positive faith, due to being overwhelmed by struggles in my life. But we worked it out! I bring the honesty, generosity and enthusiasm for Bible teachings, and she brings the gentleness, extreme patience through suffering, and gratitude.
Also, we really want to be able to get married so that we can do...you know...in a godly way, because we believe that when it's done like that, with the power of God's love and blessing behind it, it'll be way better than the worldly, trashy approach to it. And also, a couple of years ago, for six months, she dated a guy who was helping her and her mother with money and food and stuff, 'cause they were very poor. But then the guy started to think that his generosity gave him the right to coerce her into making lewd videos of herself, which he would show to his friends, and beat her if she didn't comply. And then, near the end of their "relationship", he decided to help himself to her virginity, which she had been saving...... The final straw came when she found out that he had plans to pimp her out, so she fled the place and relocated with her mother, and a few months later the jerk ended up in prison for some unrelated stuff that had nothing to do with her — but I digress. The point is, we believe god-approved intimacy will be conducive to healing, both for her, since her only sexual experiences have been horrible, and for me, because I'm a virgin who's really getting on in years (I'm nearly 48!), and I have autism and social phobia and related issues, so it's mega-hard for me to even get a partner in the first place, and it's exacerbated by an intense...umm..."drive", chronic cravings for affection and just being starved of experiencing feeling desirable to a woman in "that" way. Like, it's done my head in and often made me believe that God hates me. But now I have this very pretty young lady who wants me, and who wants me in the right way for the right reasons, and who shares with me a belief in the emotional, psychological healing power of godly conjugal love. See? So we could be fantastic together! Because this is a chick who puts her man first — she has even ditched two of her friends for being really mean to me!

In fact, she met me that way, because I was romantically involved with a friend of hers who was bragging to her about using me for money; she later exposed the same girl for cheating on me! And yesterday her other friend tried to tempt me away and persuade me to choose her instead of my girl, and when I chose not to, she insinuated that it would be "funny" if my girl died and I got heartbroken! And she was just being horrid to me and made me have a kind of "meltdown", and I stumbled and started cussing the friend out and stuff, and I went and told my girl what had happened, and requested she ditch the friend, and without missing a beat, my girl immediately messaged her and wrote this: (originally in Spanish):
"Why were you so rude to [my name]? He doesn't deserve you, so he'll be mine, and I'll love him very much. Our friendship ends here."
Like, seriously! I wouldn't call myself "good" ("Only God is good"), but...wow. You know?! A Gen Z (of legal age) Latina who jumps right in to stick up for me (a stupid, prematurely grey, badly balding, flabby guy with a beaky nose), even when mostly bedridden and in pain, kicking a friend she's known for years to the gutter....

Well, she actually introduced us; the idea was for her friend to honour her wishes by taking over and treating me with love and care if my girl dies. But the friend tried to take me for herself sooner than that, and I almost fell for it, 'cause she was being mad seductive, plus my girl is hardly able to chat to me much anymore, because she's usually sleeping. But I snapped out of it and scolded the skank, who responded with very evil words, which enraged me.... My girl had just woken up and I told her everything, and she was like, "Do you want me to tell her to [fire truck] off?"

And I was like, "You can if you want but I think it would be better if you can put it politely." So she sent her the aforementioned message, took a screenshot of it for me and showed it to me as proof, and then went back to bed! It was awesome!
She's what we in Australia call "a keeper". So I need her to survive and we need to be together. It's really that simple.
So this morning I kind of proposed to her in a round-about way, wrote her an email about what she means to me and stuff, and then basically said, "If you survive your health problems and we can be together in person, will you marry me?" And she was like, "Obviously! Yes!" So there's that. :3
(Sorry for writing an entire novel but at least now you have a clearer picture.

)