Sadly, you tend to see that kinda shite a lot of the time.
I had a buddy in the UK who went out with the same girl 4 different times after breakups and realizing she was not for him, treated him bad, cheated on him etc. Had a happy ending though - he took her out for a romantic Valentines Day dinner, drank a ton of wine at the restaurant, and - not even really intentionally - told her drunkenly that he did not have the slightest clue why he was going out with her again, as he really didn't like her at all. They stayed broken up after that one
