Why am I crying when it's obviously my fault (No, not my fault)

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I'm crying right now as I type because I cannot go home with my boyfriend for thanksgiving. He had asked me a week ago if I was going to come with him and I told him that I had too much work to do for school that was due right after thanksgiving. I thought that was the end of the discussion. Then he told me that his parents kept asking why I wasn't coming for thanksgiving since his mom wanted to me meet me. I began to feel bad but then he also told me that his other friend was going so it would be four guys traveling together, his brother, his friend and a friend of the family who's mom was like an aunt to him. His Truck can hold 4 people comfortably but he figured 5 would be crowded. So I thought that was the end of that. But it wasn't. he kept brining up the fact that he really wanted me to go and that his parents kept asking. So yesterday, I told him that I would try and let him know today. he said ok. So I let him know today that I could come. But alas, there is no room for me since 5 would be too tight. So now I'm in my room crying because he kept asking me, and mentioning it to me and then telling me it's ok to try to see if I could get the free time to come, and now that I finally have, I can't. So now that I'm done writing this, I'm not crying anymore. I'm pissed. So it's over. Thanks for reading.