Confused about my ex... I have a new partner of my same sex... still can't get over my ex? [It's a long one!]?

Ok, so this is somewhat of a long story. I don't exactly know what to say about it, but I just recently left my ex-boyfriend of just under 2 years for a girl I met and really started to like. It sounds really stupid, but to me, it's really an incredible thing that happened! If I could express my happiness into this without going crazily off topic... I totally would. Anyway, I didn't tell my boyfriend what was going on like I should have. I met this girl on a dating site, and we decided to meet. I wasn't sure how it'd go because it was totally new for me. I've never cheated before, so I felt really disgusted with myself during. I was afraid to tell him about everything to start off with because I as afraid of losing him if I really didn't like this girl. I mean, I was terrified of losing the one person that I knew really cared about me and loved me. BUT.... this girl... wow, I mean I've always been for gays, but I never thought about MYSELF becoming one. Until this girl came around.... I really never expected myself to go that route, you know? But it happened.... ANYWAY... my mind is really jumbled. I feel I have a lot to get out. A couple days after I met up with her, I told him about her. He assumed I met a guy at first and then I confessed it was with another woman. He actually understood and wasn't quite as upset anymore. Of course he was upset, but I guess he felt he should understand since it wasn't like competition with another man, if that makes sense. So at that point, I pretty much left our place and we sort of went our separate ways, aside from a text here and there. I feel extremely happy where I am at, and I'm shocked at how unashamed I am for finding another woman irresistibly sexy, since she's the first! But just a few weeks ago, he found himself a new girlfriend. He seems really happy.......... and I'm SO happy for him. But I'm jealous! I shouldn't be jealous! And I hate that I am!! I don't know how to control myself with it. I mean, I'm very happy where I am, and she keeps me preoccupied more than I could ask for.... but why do I feel jealous? =/ Any help? I hope I make sense here. My mind is hoarded. Anyway, hopefully someone can help. I have to head to bed. So no time to edit. Good night (: