Emotional after sex?

My boyfriend & I have been in a long distance relationship for 1 year and one month. He attends college in Georgia, and I attend school in Indiana. Imagine the emotions that run high, when we finally see each other and get to spend time with each other. We see each other periodically, with a few months in between.

We had sex for the first time in months, and afterwards, I started bawling. I couldn't stop crying .. & it continued to happen after every round of sex. I wasn't sad; the sex was amazing .. But, I just couldn't stop crying for some reason lol.

What is going on?

Was I just really emotional, or what?

Has this happened to anyone else?