recently came back to Christ but my bf is not religious

I used to go to church when I was 19, but I left because of personal reasons. I (24F) met my bf (24M) 2 years ago. About 5 months ago, one of my church friends invited me to come back and ever since then, I have been attending church.

When i became more regular, I decided that I wanted to wait till marriage, I had a talk with my bf, and I know that it is not fair on him to believe in something so suddenly. He is okay with me going to church but he is not able to wait till marriage (and I totally understand it) I did bring him to my church once, after we went to gym. Just casually asked if he wants to follow along and he was okay with it (I was really happy) but it doesn’t seem like he’s ready to receive Christ so I didn’t push him further than that.

But recently, he’s been pushing me about sex, and asking me more about it.. I really don’t know what to do. Today, he asked me if I will break up with him because of it, and honestly, I don’t want to break up with him, nor do I want to sin..