Can't get over it.

I am a 29 year old male. I have a girlfriend of 7 years and 2 children. A year before I met my new girlfriend I had sex with this girl that hung around some of the people I associated with. She even dated one of them. She was really hot but had a reputation of being a hoe so I tried not to get involved with her. After her asking me several time to have sex and even having one of her friends call me on the phone and asked if I was gay because I wouldn't have sex with her. One night I was drinking and we all were hanging out and we both ended up being the last ones awake. She came on to me and we started to have sex. As soon as we did I regreted the decision so it ended quick and was not good for either of us. I know I did this to my self and it sucks. The next day she told everyone how shitty it was and I had people for the next year allways bringing it up and it made me look pretty bad. Since that night I never talked to her again because of all the bad stuff she said about me. I still think about all the people that asked me about it. It really put a dent in my ego especially being a male. I'm thankful for my beautiful girl and child I have now but I allways get paranoid around the people's she told. Allways thinking she still tells people about it even though it's been 8 years. I wish I would of told her off or asked her why she had to tell everyone. Maybe it's because I had no closure. Any advice. I just need some push to put this behind me. I don't think it's a good idea now after so long to tell her how she hurt me.