He shouldn't have taken HER back.

I know he was a huge jerk lying and cheating, but after what she did he shouldn't have taken her back. She screwed her friend just to find out what it was like. What he did was unforgivable, but her coming back with another guys sperm inside her (yah, that stuff can live for up to five days) topped the cake. I would have said; "I know what I did was unforgivable, but I'll never get that image out of my head. Let's just call it quits and move on". Then I would have gotten arrested for beating John Glovers' character bloody.