<human>: So, last weekend, I made out with a girl that I do comedy with. She confessed that she had a big crush on me (not knowing I had a girlfriend) and I was weak and cashed in. Things did not progress farther. (Yes, I know I cheated, please spare me any chastising in the comments. I already have my own guilt that bears on me.)

That make out session basically proved to me I needed out of my 1.5 year relationship with my girlfriend. I had been contemplating breaking up with her for about a month and this solidified that I didn't have anymore romantic feelings there -- I never would have cheated a year ago.

My question is: should I tell the girl I made out with about the breakup before she hears through someone else? I want to tell her that it was something that was percolating for a while and that it wasn't because of her...in case she has any sort of guilt or would view herself as a homewrecker. Or should I just let sleeping dogs lie?

Can you condense the text into three sentences or less?
<bot>: Made out with a girl before breaking up with girlfriend of 1.5 yrs. Should I let her know that the breakup was not her fault so as to let her know she wasn't a "homewrecker"