Am I just incredibly stupid to believe this? DH went to Amsterdam around 4 years ago with 3 other friends, I have never had reason to think he has cheated on me and believed him at the time that he didn't partake in any prostitution activities.
For background briefly - 3 years before he went, he and I separated for a while and during that time I met someone else, I was upfront and told DH about him and wanted us to split permanently. However, things didn't work out and after 6 months or so DH and I tried again as I realised I still loved him.
A month ago one of the guys from the Amsterdam trip was at our house, we were having a few drinks as I had a friend round too. They were chatting in the kitchen and I stopped near the door to read a text I'd got. I heard something about Amsterdam and listened for a few minutes...they didn't know I was outside. DH was bragging about 'fucking her but couldn't do it properly as they only let you have 20 minutes or so'. He was saying what a waste of money it was. It was clear that they were laughing and joking about it and 'reminiscing' about that trip and I gathered that they all slept with a prostitute while there 
I confronted him straight away, told him what I'd heard. He laughed nervously, didn't deny it, said they used a condom, it was no big deal etc. We talked for a while about it and he said if I hadn't had my 'affair' years before then it would never have happened and it was a 'revenge fuck'.
It was a deal breaker for me, I told him it was over that night and he moved out 3 days later. It's been a few weeks and we got together the other day to chat as he said he needed to explain. He basically said that it didn't happen - that it was all bravado in front of his mates, especially his best friend (who was here when I heard them) who he wanted to 'impress'. He said he'd thought about it, that night, but didn't go through with it as he couldn't do that to me. But the next day he told his best friend that he had as he wanted to sound like 'the man'.
He has begged me to believe him, has said if I want he will admit to his friend it was a lie. I have to say, the thought of him doing that shocked me as it's just not in his nature but then I know enough from reading on here that anyone can surprise you..
Does anyone think it's plausible? Or pure bullshit?!