Ok, quite a lot of background needed here, and it's all a bit petty really- sorry!
DP and I were friendly with a couple. DP worked with the man in the past and they stayed friends. We went for drinks etc, went camping once. The couple split up about 2 years ago, we stayed friends with the man rather than the woman as he was DP's original friend, although I do say hello and quick chat if I see her around.
About 10 months ago the man started seeing someone new. The first time I met her I was with my mum, sis and SIL going to the theatre- we'd gone for a drink before and DP was out with this guy and new girlfriend so they popped in to where we were to say hi. Second time I met her we were out in a group of about 8 couples and singles going to a gig, chatted to her a little, she seemed nice etc. Third time I met her was again a concert but there was a much bigger group of us going along this time- including DP's mum, some people from my work and various friends (was a big concert). I spent most of the night mingling back and forth between different people.
Towards the end of the night, the guy came over and started having a bit of a go at me. He was saying "why haven't you got to know new gf? you haven't made any effort with her..." etc. His final line was "to be honest butter, you've been a bit of a DICK towards her" a bit aggresively. Now we'd all had a drink and I was a little taken aback and felt bad and my immediate reaction was "oh, sorry, I'll go and have a chat with her now", which I did but it was a bit forced iyswim.
As I thought about it more it started to bother me more and more and I got a bit upset in the taxi on the way home with DP.
The next morning the guy texted DP (he does have my number but has never texted/phoned me about it) and said "great night last night mate, hope I didn't upset butter though!". DP asked me what to reply so I just said to say "glad you had a good night!". I didn't want him to put "yeah, you did upset her" as it seemed petty and unnecessary but didn't want him to say "don't worry about it, it's fine" as it wasn't really fine.
Anyway, this was about 6 months ago and since then I've seen him twice at group events. I've always made polite but brief conversation, as has he. We've never mentioned what was said. I haven't seen the gf, not through any conscious effort, our paths just haven't crossed.
The AIBU comes now- a group of us are invited to a mutual friend's birthday in another city. DP and I are going and my sister is coming with us. DP's brother lives in the city we are going to but is away at the time of the party. He has offered us to stay at his house though, even though he will not be there.
DP has just informed me that he's invited this couple to stay at his brother's place too! AIBU to feel uncomfortable with that? I have been happy enough making polite conversation in group settings but don't really want to spend a whole weekend with them, and sleepover with them e.g. seeing them in the morning in my pyjamas! Am I being totally pathetic and need to get a grip? I feel that way now because when I mentioned it to DP he said "oh ok, I'll just tell them they can't stay as you won't feel comfortable" which obviously I don't want him to say!
AIBU and what shall I do?!