I know what you are going threw been there, done that. When I was still with my ex I had the same sort of problem. Although I didn't meet him online I found out after we had been living together for a few years he was going online and setting up accounts on dating sights, a lot of them. He spent a lot of time online and most nights I went to bed alone while he stayed up a chatted on yahoo messenger. Didn't bother me to much at first but one day he left for work and forgot to log out of his yahoo account and me being the busy body that I am looked. I know it was wrong but I had to. Well as the old saying go's those who look for trouble soon find it, well I found it. He had been on there talking to other women, having cybersex with a few one of them being an ex girlfriend. So I know what you are talking about, I know that sick feeling you get in your gut when you know he is online. I wish you well and hope you can find some peace.