My boyfriend who I don’t live with shares an adult son with an ex partner, who has always been vile to me for no reason, they’d split up long before I was around and I’ve always tried to include the son as much as possible I mean he is in his twenties so has his own life, they shared a dog for the last 11 years shared doggy custody kinda thing, dog is very unwell sadly and is being put to sleep next week, the ex is obviously wanting to spend time with the dog, but she’s spent every day at his house since Wednesday and wants to spend the night (on the sofa!) with the dog. She’s expressed that she doesn’t want me there when the dog is being put to sleep, so I won’t be able to support my partner, I feel very uneasy that she’s spending so much time there & over night I feel like I now have to check if I can go over in case she’s there and I feel like an outsider in my own relationship, I feel awful about the dog of course so I don’t want to bring it up or make an issue out of it, but am I being unreasonable?