DH travels quite frequently for work and is often in a different place every day of the week so we don't generally discuss where he is in any great detail - it will just be 'x today, Y tomorrow' etc. Recently he's started a new project which involves a flight to get to and last week he went there for two days. He told me that the two guys he'd previously travelled there with were already out there so I assumed he was going alone although he never actually said he was/I didn't ask.
He phoned when away as normal but he didn’t talk much about the trip when he came home. Few days later I found a pair of woman’s shoes in his car. Asked him about them he said 'oh they're Chloe’s from the other day', apparently when he went away she had gone with him. She works on the project too, I've heard of her before but had no idea he was travelling with her. She'd parked near the house and he'd driven her to the airport, they flew together, stayed in the same hotel, went for dinner with the others etc..
He says he doesn't understand why I'm annoyed, that he didn't think he needed to mention it and it's no different to when he travels with one of the guys, I'm just concerned cause it seems like he purposely didn't mention it.
There’s a few other things that bother me about this woman, like the fact that I’ve seen lots of messages from her in his email but don’t know if I’m being unreasonable to be bothered about the trip