I live with two lovely girls in a flatshare in London. Recently one has got her first boyfriend - she is mid twenties, myself and the other flatmates are ten years older, relevant because maybe I'm just not being very sympathetic to the excitement of first love - and this week he has been here three evenings already and it looks like he is planning to be here tomorrow as well. Stayed last night and has been here all day.
It's a tiny flat. Just about fine for three, not fine for four. No lounge so our shared space is the kitchen, which they stayed in all afternoon and now are making plans to cook a three course dinner in tonight.
I'm normally very relaxed about this sort of thing, but I feel like he is here a LOT and in past houses we had a lot more space so less of an issue when a friend's boyfriend came from out of town to stay for a couple of weeks etc. I've always had friends and partner over but only one or two nights a week.
They have only just become an item. I don't want him unofficially moving in and staying here half the bloody week, but don't want to say anything right now in case I'm leaping to conclusions or being mean.
How can I nip this in the bud or AIBU?