Why would he not reply back? i m freaking out for no reason i think..?

Dont stress....Guys dont find it mandatory to reply to a girsl message and the dont wait around like us girls to see a reply...The just go with the flow. Yes wish him happy birthday but if he doesnt respond after that leave him be...whatever u do DONT MESSAGE HIM ALL THE TIME.(AKA everyday) If hes interested he'll get back to you. If he doesnt reply by his bday, Id forget him.