i'm going to pass on some advice that someone passed onto me..i saved it
"The guy is not saved - what's the basis of the attraction? What do you have in common? Now, I'm not saying that you can't be attracted to an unsaved guy, cuz that ain't true - some people have good qualities, they're intellectuallly stimulating, they do conversation well, or whatever. I'm just asking to get you to think about it, cuz that will answer a LOT of questions.
Secondly, if he doesn't know Christ, the FIRST priority is to be a living, uncompromising witness. Your interaction should draw him to CHRIST - by your example, your conversation (that doesn't mean that you always have to walk around saying, "Praise The Lord!", either. But your conversation should be kept clean, absent of flirtation, be seasoned with grace and speak life and wisdom). Invite the guy to church - and don't have him come with you, either. He should come by himself, on his own. If he's resistant, that says a lot, right there. Submerse this guy in prayer. I have never known God to "remove" an attraction to anyone - you must manage it. As you submit your will and desires to God, He will give you the grace to handle the attraction, as you bring your feelings under subjection (something YOU must do). Once you discover the origin of the attraction (ask God to reveal what's going on), that may cause it to dissipate. Be careful about how much time you spend thinking about him, cuz that only fuels the attraction.
My prayers are with you - that God would speak to you and you would HEAR. Seek counsel from your spiritual leadership - they are your covering."