A lot of these sentences frustrate me, and I don't think anyone quite expressed my frustration so I will now. You say you are a believer but "not very religious" and that you are not practicing, and yet your faith is an essential part of you? Explain this. Because faith without works is dead. One of my friends describes herself as "orthodox christian" and "not very religious" and because I know her quite well I can honestly say she is not a Christian. Her family has a few Orthodox traditions, and I think that she believes God exists, but I know she doesn't believe that, for example, premartial sex is wrong, and she has told me that if she married an unbeliever, and had children, that she would let the children decide their own religion. I do not know much about you, but like I said, by your own admission you know that there is something incomplete about your faith. When you say, "his faith is so important to him, made me realize that i should also take care of mine", this could be very dangerous if you mean it in the wrong way. The wrong way would be where you are going to end up trying to impress him with surface level Christianity. However, if you mean it in the right way, then he has already made you realize your faith is dead, and therefore you no longer need him, turn to God. But if you think you need this guy to bring your faith about, then clearly there is a wrongful motive at play.
In addition to all of this, as has been mentioned, there is a good chance that his faith is also not what it seems to be. Indeed, he could be keeping up his faith to try and impress some other girl in the church for all we know, I've seen it happen. The problem is complex, but the solution is simple; get right with God on your own, and talk to this guy about the details, where the devil is hiding. I'm talking of course about morality, which is where the surface level Christian tends to show his true colours. Like my orthodox friend, if asked her religion she will say "Christian" but ask her about homosexuality, abortion, fornication, divorce, lust, or drunkenness and you'll find yourself talking to an atheist.