This is childish, but hear me out. This is causing me a crazy amount of grief considering how stupid it is

I bought a custom cosplay of a DnD char from a guy who ended up being a complete psycho. This guy is really cool, and nice at first... but when you get to know him, he shows his manipulative, aggressive, toxic side. I didn’t realize that in the cosplay community he has a track record of being a dick, but at the same time he is extremely popular (idk why it works like that.)

During the ordering process he was condescending, and began gossiping about me and making fun of me and saying really awful things to other people. I was pretty floored that he acted like that. I paid a lot for this cosplay and it means a lot to me but I am afraid to wear it. I hate being associated with his brand. every time I see my costume or char I get really bad anxiety and bad memories. I feel like I am anxious to wear it in public because I don’t want him to see me and somehow feel like he has power over me because he made my costume. I feel like I am beholden to him somehow. 

I know the answer is to not care. but it is so hard. The root of my problem is I care too much about what people think of me. I am very easily effected by things people say or do. I think I just need someone to reassure me that this is dumb. Thanks for reading.