Edited to be more concise.

It sounds like you realized after the birthday blow-off, that he's just not that into you. Good that you recognize this.

When a guy's words and actions don't sync up with the woman he's dating, it's because he's not really that interested in meeting her needs and desires and goals. Because he just sees her as temporary until he meets the right woman.

Make other plans for your birthday. Delete this guy from your social media (if you can do it), from your cell, and forget about him. Guys who act this way, do it, because they don't care.

Relationships are simple. If he respects you and sees you as long-term material, his words and actions will always sync up and you won't be left guessing what his motives are.

This guy? He strung you along. Cut the string. Go no contact. He's never going to commit to you for a real relationship. His actions have shown you this. No guess work needed. He's not the right guy.