Help Saving my Marriage

Help Saving my Marriage

I've been with my partner for 6 years and happily married for 2 of those I thought. Recently he's been distant and I've had the feeling he's hiding something from me, he's also been staying up half the night telling me he's playing games online. Yesterday I did something I maybe shouldn't have and looked through his emails. To my horror I found over 200 in his inbox mainly conversations on facebook where people had written on his wall. Some of them were personal asking questions about our marriage and what he is going to do about it long term. I don't know what his answers were. I also found him advertising on a dodgy dating site for no strings sex.

Last night I confronted him, calmly and explained why I'd looked. He says he knows nothing about the dating site (despite the log in detail email) so guess that's lie no.1. The woman he's discussed our marriage with is a work colleague. I've been hitting the wine a bit lately with a stressful change of job and he claims I've pushed him away and he had to talk to someone.

I feel totally betrayed. Am I being paranoid?

He's immediately changed the facebook emails to go to his secure work inbox so they're hidden, I've asked him to show me what he's been saying about me tonight and he's agreed but I think he'll of deleted what he doesn't want me to see.

Iwant to ask him to come off facebook, I don't feel I can trust him on it. It's too easy to get close to people online but I think if I force him he'll just use another site or name.

 What should I do? 24hrs ago I trusted him.

 Mel