Does he have feeling for me?

Hi, I'm pretty new to this.

I have always believed I was straight, and am still attracted to girls, but there has been this guy who I think I may be attracted to. When we first became friends, we got very close very quickly, and within a few months, we knew virtually everything about each other. We spent hours together, and did a lot of things together, usually stuff people would do by themselves, like going into town to get something etc. He has had a lot of girlfriends over the year, and has one currently and has had for about the same time him and I have been close. He used to be quasi-homophobic, but not as much anymore. A few of my friends think that he could be gay, but they don't know why, just a feeling, one of which is actually gay himself.
He admits he doesn't show emotion in public and that he is very insecure with himself and doesn't have much confidence and likes to fit in with people (Maybe why he has a girlfriend). He rarely saw his girlfriend, and spent months flirting with other girls, and didn't seem to spend much time with her. It's only recently, after nearly a year that he's starting to spend more time with her, and actually talk about her when he's with us.
We have told each other that we would be there for each other, and said that we are best friends with each other. I am the only guy that he is very close to, and possibly the only guy that he's been very close to. Anyone else who he would consider a close friend is female. He doesn't act stereotypically gay in anyway, so I can't give any evidence there, he's completely straight-acting, as am I.
Any time I went anywhere, he always wanted to know, or who I was with. Even sitting in class, he would always poke me or steal my stuff. Or when I was getting past him to get to my chair at break or something he would make me fall so I fell on top of him. He once crashed a date of mine with a girl, and any time I try something with a girl, he likes to know about it.
He has never been this close to any one else as he has been with me, especially not for this long.
Like me, he is very religious, so maybe that could be preventing him from doing anything. He has a place online where he writes down all of his emotions since he finds it hard to in real life. He says about girls that he has feelings for and all, but they change quite a bit, and I'm pretty sure he hasn't told his girlfriend about this place, since it says how even though he has a girlfriend, he would rather chase after someone else.
He said to me he wouldn't mind if I was gay, and I said the same to him, and he replied with "Good". But one time, he thought I fancied him, but I said I didn't and denied it, but he got angry at got more distant from me. Why would anyone who was a best friend do that? Maybe he is afraid of his feelings?
In the past few months, he has become more distant from me, but I don't know why. He's been different this past year or so, less like himself and more like well everyone else.

I know this isn't a lot to go from, but are you able to tell if he possibly has gay feeling towards me? we are going to university next year, so still in school. Please ask more questions as it is hard to think off the top of my head everything.
I also want to know, can a guy still be gay if he has had a girlfriend for a year-ish like the way I just described? Could it be a cover-up. I know that they haven't done anything beyond kissing. He has before, but has refused to being touched by a girl, only he does the "touching" apparaently
Thanks for all your help,

Felix

 

Thanks for your reply.
I don't think it's because it's because I didn't act on them earlier. I sort of half-did, messing around, jumping on him, having deep conversations with him. I told him once that I thought about him a lot, and what he thought it could mean. He got a bit distant, and accused me of fancying him even though I didn't actually say that.
Could he be getting more distant because it goes against what he wants to be, and is forcing himself to not be attracted to me? Could that be why he is starting to spend more time with his girlfriend all of a sudden?

 

Do mean as in he wants to tell me but can't, or vice versa?