I am stuck. Please help.

[FallenAsian]

I am 30 years old, Asian, sober and I give a big shit about this post.

I was dating a girl named D, I liked her a lot but she wanted to keep on dating with other guys if possible. I did not like that but went along.

I belong to a running club, one runner named K flirts with me. So one day we got very buzzed and went to her place. I felt really bad, I felt like cheated D.

A week later D broke up with me. She just decided to stop dating with me.

I went to the Halloween party a few days later with K and saw D there. K got drunk, started hitting on some guys. I told K I am going home, went outside and saw D. I started talking to D and one thing led to another we went to her place.

The next morning D asked me if I had sex with K and if I did, was it while we were dating. I told her the truth and she told me to dress up and leave. I felt like shit said sorry thousand times and let my self out.

Someone found out what happened and called K. When K and I went to a dinner last night she flat out asked me if I left her at the party and fucked D. Oh yeah, I felt like dying right there and then. I was done lying so I just told her what happened. Surprisingly K was super understanding, she said she was sorry for hitting other guys at the party. She thinks shit like this happens and I should not be so hard on myself.

I just found out that D decided to join our running club with her another ex bf all of a sudden. Well I think D and her friends are trying to make me leave the club, and may be they want some kind of a revenge from me. I would hate it since I've been with the running club for years.

I feel really bad about this whole situation and I hate my self for causing all this crap. I don't want people hate me. What should I do?

If they want me to suffer, they got what they want. If they want more, I will try my best to make them happy.