Hes different than the man that you want.

Although its very obvious that your being cheated on, a funny trend im seeing on Reddit is people saying "im the type to this or that" then doing said action as if them saying they normally dont excuses them. Either way, sorry for your discovery.

Its wild to me that you checked his location so quickly, It almost seems like he didnt know what his friends had planned until they told him.

Where you upset that he didnt spend his birthday with you and thus decided to spend your evening stalking him? Interesting relationship.