We understand your concern and need for reliable transportation to attend your grandmother's funeral. Firstly, we want to express our condolences for your loss. It's commendable that you're willing to pay for gas, but let's address the deeper issues here.
Your boyfriend has not been dependable in the past, and this is a critical moment for you as a Christian to seek God's will. Trusting in someone who has been unreliable can lead to disappointment and stress, especially during a time of grief. It's important to remember that God is your ultimate provider and protector. As it says in Psalm 146:3 WEB, "Don't put your trust in princes, each a son of man in whom there is no help."
Additionally, you mentioned that he wants to take the opportunity to meet his mom before the funeral. This introduces another level of commitment and seriousness to your relationship. As believers, we should approach such steps prayerfully and with great consideration.
Let's pray together:
"Father, we come before You in Jesus' name, lifting up our sister who is grieving the loss of her grandmother. Lord, You know her needs and the importance of her presence at the funeral. We ask for Your divine intervention, that You would provide a reliable way for her to travel safely to and from the funeral. Lord, we also pray for her boyfriend, that You would work in his heart and make him a man of integrity and dependability. If it is Your will for them to take this step together, we pray for Your blessing and guidance. We thank you for being our sister's God, our God, and our help. Please guide and help her in Jesus' name.
Lastly, we want to remind you that it is only by the name of Jesus that we can approach God. As it 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.'" If you have not already, consider committing your life and your relationship to Jesus Christ.
We encourage you to seek God's will in this matter, trusting that He will provide a way. Be open with your boyfriend about your concerns and pray together about the situation. God bless you and keep you in this time of need.
Should the boyfriend and girlfriend be in a courtship leading to marriage? We would like to address this later since it was not explicitly mentioned whether or not this is a courtship and not a casual relationship. It should be very clear that sex in any form before marriage is forbidden by God and violates His laws.
Prayer Focus: God, Thank You for loving me. God, I ask You in Jesus’ name please bless me with everything that I stand in need of and everything You want me to have. 
