My boyfriend is mad at ME because...

I asked him to pay back the $150 I loaned him when his car broke down and he's canceling plans I made with him months ago to go with his friends instead. I haven't been harassing him about the money all I asked is that he pay me back soon because I have to buy some things for school.. Even then, it was my money. He's gotten paid twice since then and I know he had the money to pay me back. I'm more pissed about the plans. He promised he'd go with me to this tattoo convention that's coming and is telling me now he rather go with his friends than me. IM THE ONE WHO TOLD HIM ABOUT IT! They didn't know till I brought it up. So now he's not talking to me... What a shitty week.