They can be very annoying. There's a lot of drama created by complicating relationships though. I Liked Diane, so I felt bad for Owen when she left.

That scene just showed how self-involved Gwen was. She didn't feel bad for wiping Rhys' memory, she was crying because he wouldn't forgive her for cheating on him. All she cared about was being forgiven so she could feel absolved of any wrongdoing.

I'm sure he wouldn't; Ianto has taste and self respect.