Bad Break up and I need some help

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Long story short my ex dumped me last monday. He's 25 and I'm 30. He left, like he always does on Wed night, to go to his second job which is about 60 miles away so he stays there two nights a week at his brothers house. Well he left Wed night called on Sat night and said he was going to stay till Monday. No biggie it was horrible weather here and I didn't want him to drive home in it.

Next time we talk it's Monday morning he said that he quit his job here in Los Angeles, hates the commute he has to make (its only 20 miles), he's going through the darkest days in his life, and want's to lead a str8 life. We were friends for two years before we started dating and were in a 1.5 year realationship and lived together for the last 6 months.I knew he had had a gf 5 years ago and she cheated on him, but he said since he was little he always fantasized about men, and had messed around with 2 others guys prior to me. I knew the relationship was running it's course and well was a bit relieved, but angered at the way he left.

He left me hanging, literally, I had to ask my parents to help me out with rent for Jan.
Even though I knew deep down inside that the realtionship was running its course and wanted to end it in an friendly way. With the doors open in the future to a possible friendship.

Well I find out less than 36 hours after we broke up that he had found a 21yo gf (he just met her 3 weeks ago), and just moved in with her. I found this out via a mutual friend. Well I was enraged, and saw red. Ive never felt so mad in my life. I felt betrayed, lied too, cheated on, and the list goes on. In that anger I sent her a message stating that he had been in a relationship with a man for over a year, dumped me, let me hanging with the rent and bailed on me. I also told her to watch out since he might do the same to her. I know that was childish and infintile, but I was pissed. Did I act like a psycho? That's when everything went down hill. We got into a huge fight on the phone an hour later.

I've gone through all the range of emotions. I cried for two days, I'm really sad that our relationship/friendship ended in such a way and feel like crap. How can someone just throw away a 3 year friendship and 1.5 year relationship just like that. Is he gay, bi or str8? What is this girl thinking of moving in with a man who just got out of a gay relationship. I really want them to breakup and him come back running to me. Even though I know he's not good for me. I hate being on this emotional roller coaster. Happy one minute a mess the next. I hate seeing couples our right now, especially during the holidays. Just the thought of my ex holding this girls hand makes me wanna vomit. I can't even think of being with another guy right now, let alone dating. I don't want to let anyone close to me right now. I want to stop thinking about him, I want him out of my mind and life.

I just need some advice on how to handle this situation. Is he gay, str8 or bi? And why should I even care about that right now. Any help would be greatly appreciated.

Thanks.