He was registered on POF and various "sex chat" sites between October to Jan, only getting rid because I found out. He said it meant nothing and despite the fact that he'd messaged tons of women and got into full on conversations with them, trying to arrange meet ups etc he swore that he never intended to meet anyone, it was all something to do whilst bored at work (despite telling me he's too busy to text me whilst at work, fucker).
I was a stupid twat and forgave him.
In february I found that he'd been registered on a casual sex site and was trying to arrange to meet up with a specific woman on the night that I was working late when he'd told me he'd stay home and keep my kids company - he swore he wasn't really going to meet her despite telling her what time he finished work and would she like him to pick her up in his car or meet somewhere mutual. no - obviously not "really" planning on meeting despite getting the specifics sorted.
We had a huge argument and I told him to jog on. He talked me around, cried, made me feel sorry for the poor messed up little man and I gave him another chance only to then find out that he'd been back on the site twice the following day and 4 times the following weekend!!! but no, he was apparantly just deleting everything off it 
cos yeah, it takes 6 log ins to do that, right.
He eventually shows me proof of getting rid of this site.
So I'm all sucked in again, we decide to start looking at houses again (we'd put a hold on this) and have arranged to view 3 houses this weekend. He even asked if I'd consider changing my kids' school so we could move further afield -
And guess what I've just found on his laptop - upforit - a site dedicated to casual flings/sex meets etc etc - I didn't even need to snoop for it, the idiot had left the page open, got up late for work and obviously forgot to delete it on his rush out of the door. Absolute nob. He's saying it's a pop up window that comes up when he's downloading movies/games but I think this is bullshit, I've opened the download site 3 times this morning and NO pop up windows have come up.
I'm more annoyed at myself than him. How many times does one have to be shit on before they start smelling the stuff!!! fucking idiot that I am.