I slept with another guy
Why did you sleep with another man?
I'm so frustrated and I desperately want to do something different from my routine.
If you have a partner you agreed to be in a monogamous relationship with then it's terrible wrong to cheat on them and sleep around. If you have the desire and willingness to cheat then you should just leave the relationship that you're in.
I don't care about you and or your opinion.
Well that doesn't change the fact that cheating is wrong and you're wrong for doing it. You really ought to end things with your boyfriend now.