Jane's now an unsympathetic, cheating tramp....
Is this what the writers were going for? Or are there actual people who believe what she's doing is appropriate? Newsflash....when you're married, it's not OK to sleep around because you're mad at your spouse. Cheating is cheating. She's now the most disgusting character on the show.
I'll go one further....if you truly care about the person you're with, you won't want to cheat. You won't even want to be with someone else for some time after you split. Anyone who feels otherwise is a self centered, disloyal cretin.