Re: Help with this complicated friendship?
If you're starting to have feelings for him, it is probably a good idea to stop the sexual relationship. Right now it sounds like you're just friends with benefits, and since you're best friends, it feels very boyfriend like but its not. You need to talk to him and maybe make it clear that you have more of an interest in him than just sex, and if he doesn't have the same feelings, it would be good for you guys to stop hooking up so you can get past the feelings.
You don't have to cut off being friends with him (unless you think that will help with moving on) and the temptation/attraction you have to him may not dissipate for some time, but it doesn't mean you can't be friends. I've been there, and it is a challenge, but I found the friendship I had with one particular guy was much better when we stopped having sex.