<human>: So she left me. She found another man with more money, turns out who she said was only a friend was a rebound man. She sent me a video of her kissing him before I went no contact yesterday. 

She did a number of horrible things to me. Like emotional cheating, manipulating me to buy her expensive gifts and talking down about my family. She would also accuse me of cheating based on unfounded claims. She used to think that a waitress at one of our favorite restaurants had a thing for me cause of the way she looked at me. She explained she was insecure because I was so young that I still had more time to get another partner than her.

Still my mind keeps playing bittersweet memories of us walking down the Riverwalk, having mind blowing sex, and laughing and telling jokes, and looking deep into her eyes right before we would fall asleep every night.

Can you give me a shortened version of the text?
<bot>: Why do we tend to romanticise exes instead of realizing what they really were? How can I train my mind to remember the reasons we weren't right for each other