Context: Last time I was at his place, the first thing his mom said to me was "Hey! We haven't seen you in a long time! We were starting to think you were a bad girlfriend." 


I told her why I was busy- my grandfather has ALS and him and my grandmother recently had a slip and fall incident, which my grandmother is now getting surgery for. My grandfather is unable to care for himself so I'm spending pretty much all of my free time caring for him and it's been really tolling on my family and I. 


My s/o didn't say anything to her about anything I was going through prior to this conversation. Basically, his mom would ask "Hey, what's up with  your girlfriend? we haven't seen her in a while" and he'd just not tell them anything, which gave them the impression that I was blowing him off. 

After this, him and I had a conversation about our relationship, he admitted to me that he vents to his mom about me and that she doesn't think that we should be together. She told him to break up with me. 

Today is his birthday and he wants me to come over, not for a party or celebration or anything, but just to hang out. If it were a birthday party, then I'd be willing to put it aside, I suppose. He said she's not going to be home, but, I'm not comfortable because I don't feel welcomed in her home. 

AITA? 

TLDR; Boyfriend's Mom has a bad opinion of me, to where she's openly said she doesn't support our relationship. BF lives with his mom and I don't feel comfortable coming over. 