If you go over to Cheaterville, there is a lovely post that someone left on the site which says that Jesse told this woman he and Kat had split which is why it was ok for them to be together. The woman who posted also says that she left her husband to be with Jesse so this makes it a win win for everyone. Oh, and the woman says that Jesse left her something which does not go away. STD?
For her part, Kat went on her Facebook and apologized for all the back and forth confusion to her fans. She says she is not in a relationship right now. I think she takes him back.