Pissed off

Okay, so I don't drive. But I am working towards getting my licence. Anyway, I started work tonight at 5:30 and in order for me to get there in time I have to get a bus at 4. So, boyfriend told me he was going to be home early from work, so I asked him if he would take. I never ask him because I know how much he doesn't like it and I don't like relying on him for lifts. But it was hot and raining and I just wasn't in the mood to catch a bus. His answer was that he was going to pick me up because it was going to pouring with rain by the time I finished. And I was like yeah okay that's better than nothing. Now, he messages me 20 minutes before I finish saying he's getting high with a mate so he can't pick me up. I'm really pissed off at him now, not because he isn't picking me up. I don't mind catching the bus, I do it all the time.  But I'm pissed off at the fact that he already offered to pick me up but now he's decided he can't because he is high. I don't know, I go out of my way to do anything and everything for him and he can't seem to stick to his word just once. I don't have many girl friends I can wings to either so I feel like I'm going to explode because of his lack principles.