Came to start a friendship, running away after sex. what now?

My friend that I know from junior school found me one day out of the blue and came to my apartment, wanting to start a friendship a couple of years ago. We were around eighteen years old. He lives in the block next to mine. This turned out to be with a sexual interest, as it started to become mutual masturbation after some 'massaging' quickly evolved! I could never have anticipated this from anyone as it had never happened to me before, nor did I behave like that with anyone before! He was very erotic and turned on, thus we started to experiment everything from the porn videos that we had seen.(we, as teenagers in our greatest time were ultimately doing this in the most adequate situation of our lives).
This was covered with some excuse about trying to find girlfriends together, but I didn't need any more after that as I was starting to get more turned on by the gay things, like he was too. He told me that he had done that once before with yet another friend from our class, but that they had promised themsleves to never do it again! We carried on meeting sooner as time went by and after touching, we carried on with oral sex. He told me how he jerked off on me, and having sex with me, as I did too. Although we did comunnicate when we didn't meet, he didn't want to create any references. I saw he was getting scared and unsecure about the fact that he liked it and that it had turned into something with me. He loved it, but wished that he didn't. He wanted to not have those feelings that turned him on full time! (he's a PISCES).
I liked it too, but didn't like the lying. With me, it's either all or nothing (I'm a CAPRICORN). I didn't really wish for that sort of thing in my life, but he helped it grow. As time went by I accepted it and I wanted it to grow even more, I got turned on and I wanted us to fuck 'till the end, but he stopped and couldn't let anything else happen, even though he would have. Those double-sided feelings are so difficult and seem un-solvable to me. But why did he start it at all, then? That's what I can't get.
Out of guilt he started going to his church saviours and was getting really put off by the fact he had sex with another boy. He told me he didn't want us to touch anymore, so it returned to masturbation, later stopping completely. I understand wanting to stop, but after all that happened previously, it can't just be blocked, wouldn't you agree? If anything, we could at least continue talking to eachother and solve it like that, since this way is only making it worse. So, what now? Any help would be appreciated.