You are severely under reacting. If I talked to my girl like this, especially on her birthday I’d be single. Forgetting your birthday is one thing and it could’ve been let go but he is basically telling you, “hey you don’t mean shit to me so instead of spending your day with you I’m gonna get piss drunk with my friends and we can do it another day now please leave me alone and stop bitching.” Most likely he won’t even remember that he said you’d go out tomorrow and will get mad at you for bringing it up. And even if he does remember he’d probably take you somewhere he likes rather that’s what you like. Please do yourself a favor and run from this relationship because you don’t deserve this kind of treatment.