My mum has been seeing someone for a few years now (not entirely sure how long), I have heard about him from my sister (who assumes I know about him) but my mum has never mentioned him. I dropped off some things at her house last week (unannounced) and he was there and she is clearly unhappy at me just turning up.
I see her a lot but she normally visits me. She doesn't want me to know about it. I have no idea why this would be, I genuinely don't care who she sees. This doesn't bode well for our relationship, does it? I feel quite upset about it all.
I'm 30s and she is late 50s.