Did either of them honestly expect any other outcome? I don't exactly condone either of those actions, but at some point victimization has to take a backseat to reasonable expectations. You date thief and she steals from you, it doesn't make it right, but what else did you think was going to happen?
It's reasonable to expect that a porn star will be having sex with other people (at the very least in the course of her ...er...employment (didn't want to say "job" ) )
I don't think it's reasonable to expect an MMA fighter will be abusive or inappropriately aggressive outside of the ring/cage/whatever they fight in, can't say I know a lot about it.
But decisions (whom to date) and actions (how to behave) have consequences, that is true.
"The trophy problem has become extreme."