Am I a bad person?

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Alright here's the scenario, bear with me because it's going to be long. A few months back I was cheating with a girl who had a bf (yeah I know, cheating is bad and im probably a terrible person for that reason alone, not doing that anymore but it helps set the stage) and met another girl who was interested in me. It got a bit weird there for a bit since I wasn't sure if she was serious or not but in fact she had made it clear that it would never work without me ending said "other" relationship. In the end it didn't really work out and it ended badly, soon after that I stopped seeing the other girl. In the end she blamed me for not heeding warning and I was just confused but ultimately it was my fault and im not going to avoid that (fault seems to be an important thing otherwise I wouldn't mention it). After this I continues seeing the second girl at an organization we both help at and things were fine for a while and then she started I dunno if you could call it "seeing" or whatever but anyway this other guy we both knew, I was obviously jealous but had no intention of breaking them up and I knew that I had lost my chance so I just ignored the feelings. They did but I started resenting the second girl and I wasn't quite sure why, just didn't want to be around her or see her and always felt as if I had to be mean to her, I ignored this as I could but I figure it was would fairly obvious. Recently I wrote on my blog as to which a total of 2 people read (as far as I know) and you can guess which 2 people those are, I posted about what I thought about this second girl (I have a thing about her talking about people behind their backs) and she went nuts at me in my comments (which I had expected). Since if I will reply it will just come down either an argument through the comments of some other medium I figure why not ask Mylot what they think. Im not looking for you guys to decide a 'winner' or anything like that as I really don't care and regardless she's going to hate me now anyway and if thats the price of writing what I feel then so be it.