We've been together 7 years, married for 3yrs, and have a 1yr old DS. I'm back to work in mid Sep. I recently found out my HB had joined a dating site, had messaged a few women but not actually received replies or followed up etc. I was extremely hurt but thought we'd got through it, and discussed due to challenges of young baby etc. then last week I don't know why, and I do feel dishonest, but I went through an a/c of his and found he'd also been messaging women via dating sites when we were engaged, even sending an email the week before we got married and whilst we were on honeymoon!!!!
I confronted him, and he cried and said we'd never discussed our pretty non-existent sex life, and he was so frustrated. He said it had only been emails. He's right tho - we barely have sex at all. In fact it all started 6 months after we got together and I had an abortion 
He was completely unsupportive, and in the depths of low self-esteem and huge guilt about what I did, I stayed with him. He said he didn't want to pressure me to have sex after all that, but I remember it differently and feel he actually was never that interested in making an effort in that department with me.
Anyway, sorry for the v long post. I've asked him to find somewhere else y