So my boyfriends half sister is graduating college on the 4th in town and my mom is having a birthday party the same…

So my boyfriends half sister is graduating college on the 4th in town and my mom is having a birthday party the same day. His half sister doesn’t like me and she’s made it very obvious, even though we’ve literally only had maybe one conversation together. so I told my boyfriend both of those are going on the same day and he can go to her graduation but I won’t go with. Now he’s not sure because he doesn’t really want to go to her graduation either, because she doesn’t talk to us. But then again he doesn’t want to feel bad for not going. I feel bad telling him I don’t want to go but I really don’t care for her all that much. Plus my mom is making chicken enchiladas soo id rather stuff my face than go and be miserable