Once a cheat always a cheat? What's everyone's opinion

...depends on your level of tolerance. I let people do bad things to me once or twice. I blame myself and think why things happen. I'll try to think on the other person's perspective and try making sense of everything. Try to compromise and all. But comes the third time, I'll make sure to give an unforgettable parting "scene" and throw everything away. 3:) bwahahaha.