Work was getting boring and my boss wasn't promoting me, so I cheated on my boyfriend just to get ahead at work
Wow, not many people admit to something like that. Work is more important to you?
Yes, I needed a leg up with a superior to climb up the ladder.
So you wronged your place of employment and your boyfriend, both at once. I'd be careful, your actions will have consequences.
Whatever the fuck. I don't care, I just wanted to win.
Sounds like you might have won that round, but this type of behavior will catch up to you one day. Like they say, what goes around comes around.