My 'pothead' boyfriend forgot my birthday?

OK first of all, my boyfriend is a pot head! And smokes weed like every day...Morning, daytime and night. I think hes pretty clever for a pothead though, so yeah im like 2 weeks older than my boyfriend so remembering my birthday shouldnt of been a problem for him and i reminded him quite often too. He even commented on his EX girlfriends msn profile page, saying happy birthday when it was her birthday so i never thought he would ever forget mine, we have been dating for a year! He went out of town for 4 weeks, and during the 2 weeks we kept in touch through skype and email however all of a sudden he stopped talking to me..And he missed my birthday..he never said happy birthday to me! And i never brought it up either, because i thought he already knew and i dont wan to act greedy or anything. I even waited for a 'late birthday msg' but he never gave me that either, so after 2 weeks it was HIS birthday and i said happy birthday to him through email...i wasnt going to but then i thought maybe he will click on that he missed mine? But he never! I had to tell him, and he told me that he FORGOT, and i said how can u forget my birthday and he replied 'baby you know that im a pothead, i forget things' he used this excuse on me, fair enough hes a pothead but how can he forget mine and remember his EX girlfriends? Is being a pothead an excuse for forgettn my birthday? He even sent me another email saying...'baby i feel bad i couldnt send u a late bday msg cos my internet connection wasnt working' But i saw him comment on his friends profile? What is going on with him....Im really confused..And i even sent him an email 3 days ago he still has not replied back! Wot should i do?