I found out that (through hearing his side of a phonecall to his sister) that my partner invited his sister, BIL and their 3 y/o stay (one night and 2ish days) with us in a few weeks time. Apparently the plan is for them to have our (partner used the word 'my' on the phone) bedroom rather than spare room because it's bigger.
I'm due to be away on a work trip that weekend so probably won't be there anyway. He arranged this weeks ago but apparently forgot to tell me. When I queried the plan he apologised for not telling me before but quickly moved on.
Very happy to be told AIBU but a few hours later it's still really bugging me. Id be totally happy for them to come but would have really liked to be informed, or ideally asked. Partner lived at flat alone before I moved in just over a year ago and it often still feels like 'his' home rather than ours. Would this bother other people too or do I just need to let it go?