Too emotional?

Last night I was super emotional and if you know me, you know I'm almost never emotional. And it was over stupid stuff. My boyfriend was picking on me and it broke my heart. Then we went to cuddle and cuddled for a bit and shortly after, he rolled over. I asked if he wanted to still cuddle and he said no. He was tired, I understand that now, but last night...EVERYTHING made me cry. It was the bad crying too. Like my chest hurt..it felt like a breaking heart. Anyway, I never get emotional like that. Could it just have been time to let loose? Or could it have anything to do with the fact that I missed my period?