I'm going to cheat on my abusive gf
You may be better off ending the relationship if you feel the urge to cheat.
I am falling in love with another girl.
Leaving her is better than to cheat on her. It is wrong to cheat. Moving on from a relationship is not wrong.
I'll do it. I'm a self-proclaimed cheater.
Having cheated in past relationships is something that your future partners may not like either. You really are better off just breaking off the relationship.