My boyfriend broke up with me because I wouldn't open up right away since I'm shy. Was I wrong?

I started talking to this guy over the summer. I met him at my university and we became friends and would hang out sometimes. We live in different states so over the summer we would text and facetime and we knew we liked each other. When we got back to school this semester we started dating. I'm a really shy person and I wasn't completely comfortable with him yet since we hadn't spent that much time together. He would get mad at me for being quiet when we were together and he'd just leave. He said he didn't understand why I couldn't just open up because we had been talking all summer. I told him its something that has always been hard for me, but I want to get through it with him. I only saw him like twice a week for a few hours since his track schedule is so busy, which also made it hard because I wasn't able to spend enough time with him. He continued to get mad and wasn't understanding, which made me feel even more uncomfortable. After three weeks he started to ignore me and then finally sent me a text saying "we're done" and then wouldn't reply. I finally got a reply saying "the relationship sucked and nothing changed" and that he was "fed up." It had only been three weeks and we hadn't even spent that much time together. I let him know that I would get there in time. We're both 20. I'm a junior and he's a sophomore. Was I wrong?
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I feel bad though because there were certain times when he'd want to hang out and I'd say no because I always felt like I was waiting around for him and that he was uninterested. I feel like there was more I could have done to tell him how I felt.
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He took the way I acted as me not caring and me not appreciating him. He saw me as being bitchy and not trying as hard as he was trying because I wouldn't open up right away.
My boyfriend broke up with me because I wouldn't open up right away since I'm shy. Was I wrong?
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