I live together with my gf and she often call her parents and expect me to join their conversation. I really hate it! She does not even ask me if I would like to speak with anyone, she just takes it for granted. Don't get me wrong, I do not hate her parents or something like that. I can talk to them and have respect for them, but sometimes I just do not want to talk to anyone.
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[OP here] I did. She says that she understands, but after a while, it gets back to same. I just got bored mentioning it anymore...
Did you try to talk with her about it? Mby you can solve it by just bringing it up...