Gay Relationship Advice

My boyfriend of 10 months is going to this party I was originally invited to but due to the fact that we had a minor breakup, his bestfriend does not like me. I am not going to the party but I feel uncomfortable that he goes specially when I love halloween so much. I already told him about how uncomfortable I feel about it. I am not being pushy about it since I am giving him space but I wish he would cancel his plans with his bestfriend and her boyfriend so he can go with me to a party. Am I overthinking about this? too much to ask? Help what would you do?