Inn to think your bi and like your best friend who is a guy

OK, so here is the deal. Me and my friend are both the same age and both guys. He seems to be really into chicks. He can be open to the entire "gay" thing at times as well. I think I may be bi as is. My best friend and I are really close. He and I are always with each other on a daily basis, It has been this way for about 3-4 years now. He sleeps over allot and on certain occasions mainly when we drink and then go to bed he will have me hold him while he sleeps and things like that. Also, there was this one occasion when I kinda felt him up and I thought he was asleep but he was awake, he told me this about a month back. But he said he was ok with this. Hes not the type to usually be like that, usually he seems to be against the whole "gay" thing in general. But then he asked if I was and he said he'd be okay with it if I was. There was a time not to long after this when he stayed over and we were about to go to bed, and he had me lay with him and he said "I think I could be gay if it wasn't for the sex thing". Now here recently when were sober he will still decide to lay with me. The other day we were drinking and lying down and he randomly started rubbing my arm and biting me. He knows from my ex GF and other people that I like to be bit and certain things like that. He knows what it does and yet he kept doing it anyway. So I started biting him like on his shoulder and back. He seemed to like it, but we never talk about these things to much and I was curious to get an outside opinion.