My straight friend help?

I have this friend lets call him A. A seems homophobic and voices his negative opinions of gay people right in front of me (I'm gay) A has a lot of anger issues and gets mad easily... A is a hardcore drug addict as well. A knows I'm gay but still treats me fairly well compared to others he thinks I'm cool and likes talking to me. Someone else told me A was Bi and A flirted with him but I have not seen any proof of this. A has told me he's straight but is okay with me liking him (funny how he talked about wanting to kill another gay guy for liking him) A makes jokes about me liking him teasing me for being jelous of him talking to others, saying that I want him to f me and calling bs whenever I call him ugly knowing damn well I'm very attracted to him. A has admitted he thought he was gay before one time and got into it watching gay porn and kissing a boy before. A talks about me to other people I've heared mixed reviews but A denies saying anything bad at me. A is 17 almost 18 and I am a freshly turned 17 year old. A knows I'm borderline obsessed with him nand I would be very upset if he didn't talk to me. A shows other signs hes interested in me body language wise he looks at me often and looks away when I make eye contact, his eyebrow raises slightly when we talk and he's really absorbed in what I have to say and really takes what I say to heart. I don't know what to do and this has really been hard for me I knew A for about 2 or 3 months A only really started talking to me last month. I'm really feminine and A has stated he has an issue with feminine gay guys before but he still messes with me? Why? Ughf!