Wife and her male colleague

Hi Guys and gals.

I'll try and keep this short and to the point but sometimes a bit of context is needed.

One of my wife's male colleagues caused issues in our relationship a few years ago as she would not stop talking about him and how great he was. He even offered to take me out for a drink to tell me how great he was. These things on their own weren't concerning but what was concerning at the time was this.

She went to a Xmas party a few years ago which was in a different county. It was a 3 hour drive. She told me she was driving up herself as she wanted to leave early the next morning and didn’t want to be waiting on her colleagues following a night of drink. No problem, suit yourself. So she came home the next day and after I came home from work, she said she wanted to get intimate later that night. Pre planning never happens from her side as she never really iniatiates. Anyway, through conversation it came out that after their night at the bar/club they all went back to one of her male colleague’s hotel bedroom to have more drink, as the bar was closed. Apparently all her colleagues were there, who are all married. Mostly guys but one or two females too. She then tells me that she didn't actually drive up alone but had collected her work colleague, the same guy who caused issues in our relationship, and they drove up to the city where the xmas night out was being held. She also dropped him home the next day. For me, I became suspicious straight away. We spoke and she became angry that I would even insinuate that something was going on between them. I insinuated nothing, I was just bothered as to why she omitted the fact. We eventually forgot about it and moved on and I didn't hear any more about him again, until now!

My wife was at a retirement function for another colleague 3 weeks ago. This was in the same town she works in. She assumed I didn't want to go as I don't really like her work dos, which is a fair point.

Anyhow, she said she would book a room in the hotel where the function was on. A taxi home would have cost 60 euro, whereas the hotel cost 50 euro. I also offered to collect her (25 minute drive) but she said it would be too late in the morning.

My gut told me to check her phone the other day. I've only done this once and that was after she told me about the Xmas party 5 years ago. Low and behold, she had an outgoing call at 12am to one of her male colleagues at the retirement function. The same colleague she drove to the Xmas party with all those years ago. I have never heard him been mentioned in the last 5 years. She also had 6 missed calls from him just before she called him.

My gut is screaming at me, telling me that something is not right.

I'd appreciate anybodys input or thoughts.