Boyfriend's mom

E💕
So my boyfriend has been doing a lot of talking about "our bed" in "our new home"..."our house will have this"etc...like basically including me when he talks about moving out and he's been doing it while talking to his mom now and she just kinda ignores it. Like she doesn't really respond and just gets quiet for a while and changes the subject. I feel like it could be her not liking me, or thinking we'll last or I really don't know what. I'll ask eventually but what do you all think it could be (oh and her son is like her best friend, she basically raised him alone and has pictures of him like EVERY WHERE so maybe she just doesn't want him to leave) what do you all think it could be though?