So, my 18 y/o SD's ex-boyfriend has broken up with her twice. After the second time, we found out he had been cheating on her with one of their mutual friends. This was a few months ago. They have been broken up since then. SD seems to have moved on (after many tears and long conversations) and has never been happier. She's been talking to a few different boys, but nothing serious - which we think is great! Her and her ex were together for 2 years. So, last night DH found out that SD has just started seeing him again. He was very angry and blocked his cell number on her cell phone. SD is furious. We pay the cell bill. Do you think what he did was wrong?