Hurting and Lost

I was recently dating a girl from high school that is married. I'm 35 and she is 33. She sought me out on fb and we started talking back in Feb. I know it wasn't a great idea but the more we talked the more she convinced me it was over between them and she was just trying to figure out the best way to leave and take her 3 yr old son. I agreed to meet and long story short we had a 5 month relationship. I say relationship because we talk 100 times a day. Emailed, fb, yahoo messaged, saw each other 2 or 3 times a week. As time progressed I pushed and pushed because for one it wasn't right and for two I wanted to know this was real and not a game to her. She finally told him about us and he throw her out. That same day she yahoo messaged me it's over and goodbye. She begged him to take her back and he did. They are apparently working it out whatever the hell that means. She has been cheating on the guy for the better part of there marriage. I guess I'm just lost, hurting, angry, mad at myself, feel like a fool, etc. etc. etc. I know I probably dogged a bullet. She clearly isn't a great person with morals or anything of that nature. But I bought into all of it. I cry everyday and I'm not sure if it's just cause of the loss, or I'm guilty for even being part of something so f-ing stupid. Just depressed, bottom line. I almost lost my job and this has taken a huge tool on me. Mind you the whole time she told me she wanted a life with me and a future. she told me if she didn't a have a child she would have left day one for me. Don't even know how to let go or move on. She just walked away and went silent on me.