I'm going to tell my gf I'm not okay with her hiding me and acting single
Why do you think she is trying to hide you?
Because she's selfish and I want to spend some quality time with my gf
You should tell your partner how you truly feel in this situation. Her hiding you sounds like a pretty rude thing to do since it seems like she would be embarassed at the fact that she likes you. This relationship does not sound like it would be worth being in.
I'm going to end it the next time I see her in person.
I wouldn't blame you. It sounds like a toxic relationship to be in. Good Luck.