Was i overreacting?! Advice Please!?

This weekend has been filled with endless letdowns. My ex and i got back together a week ago, and we made plans to spend time together after my graduation ceremony. Long story short, he never showed up and i cried most of the day. I finally got a call at 7pm and he told me his car broke down. He bawled on the phone for a little, and i quickly forgave him. I tried being emotional support for him, and told him things would be fine, and that he'd find a way to fix his car. When the conversation ended things seemed fine. I didnt hear from him the entire next day, and i didnt mind because he gets no service at his house, and without a car he cant go anywhere. So today i was anxious to talk to him, because i missed him. The phone finally rang at 3, and he answered. Instead of being glad to hear me, he shooed me away. I got mad and told him i was done. Did i make a mistake? Was i being over dramatic? What should i do to make this right... i dont want to lose him, but he's pretty pissed off at me right now. I need advice.