Weird situation - work Halloween party

🌻 • bother me tomorrow, today, I’ll buy no sorrow

Me and my ex still live together while he’s working on getting a place. We are trying to be friendly in the meantime. We went to a family/friend Halloween last week because we both knew the people there. I’d like to go to a work Halloween party but I want to go alone. He’s butt hurt saying that’s suspicious and it’s weird I want to go alone that me and alcohol don’t mix (cause I drunk texted a guy years ago). I just don’t want to go cause he’s my ex and just want to focus on forming new relationships separate from us and our problems. Is that wrong of me?