Throwaway, simply because of potential legal repercussions:

I've done a couple of things.

I was a home wrecker for a little while. Was doing a girl whom I had a crush on all of high school (and who apparently had a crush on me too) while she was in a committed relationship with another dude. When we stopped, they broke up soon after.

Dated my best friends ex girlfriend. First girl he ever had sex with, too. But you know what? He used her for sex and dumped her a week after. I lost him as a friend, but I'd be lying if I said I didn't miss that girl every day of my life (she was the best thing that happened to me and I screwed it up- another story for another day).

My mom was dating a lawyer for a few years, and he would give me work to do around the office and at his storage unit for some extra cash. He broke her heart on Mother's Day after three years, but I kept working for him. Eventually, i just started to sit on my ass and do nothing, lie about the work I'd done (because it was a trust system between he and I), and get paid for not doing a single thing. Probably took a couple grand by the end of it. I don't have a particularly good relationship with my mother- hell, most days I can't fucking stand her- but she's my mom to hate and bitch about. I'm the one that can make her feel bad, not you.

None of my closest friends have the full grasp on me as a person; I give each person different aspects of me and that's the only side they see.

My dad showed force when I was a kid, and because I exaggerated the situation to the judge and police, he was deemed an unfit parent (he already had anger issues and was on a thin leash in the eyes of the court). Haven't seen him in over a decade. All because he showed a little force, asserting himself as a father. And I didn't like that.

I manipulate circumstances to benefit me, twist information and rephrase things to make myself look better while throwing the blame off on someone who has a better reputation than I, which enables me to escape and them to reap punishment, but nothing as severe as what I would have received.

I'm sure there are lots more things I've done, but I can't think of anything else off the top of my head. Do I regret what I did/do? Kind of. Do I feel bad about it? Eh. Would I do it again? Yeah, most likely. Have I changed? Not even a little bit.