<human>: Alright, so short background. I had been with my ex for 12 years, we have 2 children together and 1 adopted. We've taken breaks in the past and always gotten back together. I still love her and deeply care about her. We had some issues that I'm not sure can be resolved (I don't want to go into specifics just in case she sees this) and we've broken up as of 1 week ago. I go to the house every day to spend time with my children so I see her on a daily basis too. After an argument on Tuesday night (we were not together at this point) I went to have a beer before going into my office to take care of some stuff that really didn't need to be taken care of, more to keep my mind of the situation. While at the bar, I met someone, and I've been spending time with her since then. That night she made me completely forget about everything that was going on in my life and I was happy. Last night we slept together and while I enjoyed it a lot, today I feel very conflicted. My ex wants me to come back and tells me she'll change, but I really like this new girl and I haven't felt his appreciated or wanted in a very long time. Today I almost feel like I cheated on my ex, I can't stop thinking about it. I don't know what to tell the girl I've met because I really don't want to hurt her and she seems to like me quite a bit as well. It's very scary to throw away 12 years and everything that was built with my ex, we have 3 wonderful kids and again, I still love her deeply. I don't know that I want to go back to my ex, or pursue something with this new girl. I'm very confused at this point and I'm not sure why I thought this would help but maybe I just wanted to get it off my chest. A few of the people I know (and that know the situation a bit more clearly than most) say there's nothing for me to feel guilty for, and I would tend to agree with them, so why do I feel like such a bad person?

Can you condense the text into a few key points?
<bot>: My ex and I broke up a week ago, I met someone new and slept with her and now I feel incredibly guilty, and don't know how to get rid of the feeling