Dear Sweet Soul
I am not sure what you mean by your 'other half' is? Does it mean his your boyfriend as you have stated that you are not married?
If he is just your boyfriend, then we got to see what does Jesus say on this issue. As you know Jesus is an understanding and loving Person and so whatever Jesus says in His word (Bible), we must then take His word very seriously, right? If so, it will be good for you to check what Jesus has to say about your situation then.
1. Luke 9:23
[If we are truly Jesus' follower] Then He said to them all, “If anyone desires to come after Me, let him deny himself, and take up his cross daily, and follow Me.
2. 2 Corinthians 6
14 Do not be unequally yoked together with unbelievers. For what fellowship has righteousness with lawlessness? And what communion has light with darkness? 15 And what accord has Christ with Belial? Or what part has a believer with an unbeliever? 16 And what agreement has the temple of God with idols? For you are the temple of the living God. As God has said:
“ I will dwell in them
And walk among them.
I will be their God,
And they shall be My people.â€[c]
17 Therefore
“ Come out from among them
And be separate, says the Lord.
Do not touch what is unclean,
And I will receive you.â€[d]
18 “ I will be a Father to you,
And you shall be My sons and daughters,
Says the LORD Almighty.â€[e]
So dear sister, please choose wisely- to follow your heart or to follow Jesus.