Is it normal for a gay guy to ask a straight girl to be his girlfriend

So yesterday I received a message from one of my best friends...well former best friend. It was a really long message basically him asking to be his girlfriend. The thing is he happens to be gay, he has told and my friends on numerous occasions that he doesn't like girls in that way, even though one of his longest relationships was with a girl. Anyway, he went on and on about how he thinks I'm beautiful, how wonderful I am and that guys are always telling him how they want to hook up with me. He said that usually when he meets a guy all they want is one thing and when they don't get it they look elsewhere. He said that if I was worried he would go gay on me that first he doesn't cheat and I would probably find a guy before he does. He said that we are at a point where we need attention so why not give each other that. However, he did end with if I happen to say no to his offer that he would be an insider for me and tell me which guys liked me, he said he owes that much at least.
I was so surprised by this, especially since we haven't talked in a week and I did take 24 hours to figure out what to say to that. I responded saying that he was one of my very best friends but I felt that he was lonely was looking for any kind of relationship. However, I told him that he will always have my attention a friend and that we can help each other find people to be with.

So this morning I sent him a text asking if he got my message he said yes I did and we are square. I was like square? and he said yeah boring, ordinary, etc. I asked him did he think we were ordinary? Here's where he did a complete 180, he was like he feels like he's the modim and has to make things painfully obvious just so he can feel comfortable and everyone looks at him like he's the weird one. But he said that he was upset that girls are just ordinary. So I got really upset and I responded that kind of said that in a nasty tone and that if you have a problem then just talk about with being bitchy. He totally went off on me, he said that I'm constantly bitchy towards him and that he takes my BS and all the while I want his dick (which I NEVER DID) and he finally took a chance on me and I sh*t on him. He told me that I need to go get my tubes tied so my hormones stop f**kin raging on everyone. A few hours later he sent me a message saying how much he disliked being my friend and basically just went on and on saying that I terrible friend to him. Doesn't matter how many times we went to the movies or ate dinner together and I always paid because he never had money and I never asked for a cent back. My question is "Is this normal behavior, not just for him but for anybody? Keep in mind that this all happened within 24 hours.