
At this point, you can clearly tell that they both need to break up. Both of them clearly doing something unfamiliar to them, overpowered feeling of love and jealousy is not something you should let yourself get lost on. If you don't know what to do, communicate, and if you don't want to then don't ever seek relationship again.
The recent story is interesting. I was getting an icked from her since she's cheating, but to see that both of them do it is just funny to me. I can see in her fiance's eyes that he thought she's innocent LOL. Men really need to be fumbled for real