I (F31) have a partner (M33) I've been with for 8 years. I wish we were married with kids already but, we're happy and are planning to have a baby soon.
We share a computer, a few months ago I went on and his Facebook account was already open when I went to log in.
A message popped up from a women, I didn't recognise her so I snooped through the messages which, I know was a bit wrong of me! There was nothing too bad and it was mainly her messaging him. I just think what she was sending was weird, she sent a selfie of herself at Easter wearing easter bunny ears and she was constantly trying to start chats with him and asking why he doesn't reply. Another thing I found weird is that she had asked him to have a phone call at one point and he said to give him a few mins as I was upstairs in bed and he'd go for a walk to take it. I confronted him and he said there was nothing to it, she's a colleague from work that messages him and needed some advice. I let it go!
Fast forward a few months to a couple of weeks ago. We had a major argument, I said I was finished - sick of waiting for marriage, kids e.c.t. I've apologised for this and said I was in the wrong. After the argument he stayed at his parents to get some space. I since found out he wasn't at his parents he was somewhere else. I snooped again, there were bookings for two on his emails and a restaurant booking. I saw a future booking for a hotel bar. I confronted him - he said he cancelled the booking and it was originally for me and him. Fast forward to yesterday and I'm absolutely devastated I found him at that booking at the hotel bar, with the colleague I was worried about a few months ago.
He still says he's never cheated. I'm so angry, I know we had a massive argument and I wasn't perfect but for the last few weeks I feel like all he's done is lie to me.
He's obviously been a massive idiot and crossed the line but AIBU to think he's fully cheated. I'm just so confused, I trusted him so much and it feels like my life's just been destroyed.