My husband had with a web camera; with his old girlfriend. I didnt find out til a year later?

Ok, so my husband decided to have cyber with a x-girlfriend. She has propositioned him before, I told him never to talk to her again. We were married sept 2005, he had cyber/web cam with her in jan of 06. I just found out about it while following womens intuition, ok I was snooping on his computer. I need opinions of how I should handle this.