For me, it's violence. If a guy shows any kind of violent behaviour I will walk away immediately and never take him back. Same goes with cheating.
Most Helpful Guy
Cheating. Apparently GaG doesn't allow short opinions so…
Once upon a time there lived a tiny little sausage named Baldrick. And he lived happily ever after. The end.
Most Helpful Girl
Violence, bullying, smoking, vulgar jokes, enjoys being rude, immature (or at least doesn't know how to act mature), thinks the world of himself (or any way of narcissism), no manners, lying, cheating, is against Christianity (I'm a Christian so this is a big deal), sexist, racist, shallow, not even the least bit committed, is known for his many girlfriends, addicted to his phone/computer/whatever else, curses constantly, doesn't respect limits, doesn't have limits, hides things, clingy and overbearing and too lovey, gets too close, interrogates people just to know things, gossips, just overall negative, depressing attitude, no self-control, don't share any interests... yep, that's my short list for ya