<human>: There isn't much of a story here. My very best guy friend's birthday was yesterday and tonight is his party but I'm not invited, yet people from work that he barely knows are going... The reason I'm not invited? His girlfriend hates me because of a misunderstanding.

He and I went out for beers about  year ago and he didn't mention it to her because it's a beer with a friend. No big deal. Then she saw a text on his phone that said "Hey I didn't mention to [girlfriend] about drinks the other night, don't say anything if you don't mind" because he was having a get together where we were both there.

She took that as him and I are having an affair now she hates me. He tried to clarify with her that he didn't want me to be the one to tell her but she wouldn't listen at all.

I bought him a nice gift as well because since I didn't see him on his birthday we were going to go for drinks this week coming up.

I heard from work friends that they're all going to this party tonight but I haven't heard anything about it from him. I'm not one to invite myself over or even just show up but I REALLY want to go since I never really get to see him anymore.

I feel like if it's HIS birthday, HE should choose who goes. Is that too unreasonable? If I hated one of my boyfriend's friends (which I do) I wouldn't "forbid" them from coming to HIS birthday party. I'd suck it up! It's not my choice. Especially if the reason I don't like that person is because of a misunderstanding.

Basically what I'm asking is this, am I wrong to be upset? Is it reasonable for her not to let me go? After all, it's HIS party at HIS house with HIS friends.

Summarize the given text in a few sentences.
<bot>: Best friend's gf hates me and won't let me go to his birthday party tonight all because of a misread text.