Happy cry after sex

Has anyone else experienced this? I had the best sex I've ever had with my boyfriend recently, we had pink lighting, The Wombats were playing and we went for passionate and romantic instead of our usual rough. I said "I love you" which I've never said during sex before, because I always thought it would be better to separate the two, but it was so good, and went on for hours. I think I forgot to breathe for several minutes because afterwards I couldn't stop laughing, and then I actually cried, I was so confused like, why was I reacting like this? I was just so elated and I love him so much and I couldn't stop the tears! I was soooooo embarrassed... this happen to anyone else?