not being a woman, this may not be appropriate for me to comment, but I believe than I can help you.
When my girlfriend and I met, nearly a year and a half ago, I had given up on Christ. I had decided that there was nothing to believe in and that I was done trying.
Then this girl that I had grown up with and I started dating. She was and is a wonderful woman and a christian woman. We discussed religion very early on in the relationship and we both knew that it was very limited because of our differences in this regard. From the very beginning, the first week of our relationship, she began to pray for me to know Christ. We began conversations about the Lord and about religion and the Bible and she took me to church for the first time in a long while. She bought me my first Bible for Christmas. I began to feel myself being moved towards Christ. I was still resisting it at first, but I know now that it was happening. A few months later when I was more open to the idea of accepting Christ into my life, we began to have a thing where we pray every night together. We were in a long distance relationship, so we did this over the phone each night. I believe that this was a very important step. In the last six months I have come to accept Christ as my savior, and I am just so thankful that He put my girlfriend in my life at this time and that, through her, He brought me to Him. In the last month or two we have begun to have nightly "Bible time" as we call it. We alternate picking books of the Bible and we read them together each night and discuss and pick the lines that mean something to us.
I apologize for the length of this reply, I probably went into more depth than necessary; and your situation with this guy may be completely different, but all that I am saying is that if you really care for him, you should give it an honest effort to bring him to Christ. It will probably not happen as quickly as you would like, but the good Lord will take care of it if you are perseverent. I hope that this helps
God Bless.