Can't control these reactionary emotions?

This girl that I have had deep feelings for broke out during our conversation this morning that she had sex for the first time with her ex-boyfriend when they were together. After a certain amount of sex, he dumped her. When I heard this, I just didn't know what to say. I'm very old-fashioned, and hearing this just made me break down emotionally. I didn't expect someone like her to do this until she was eighteen or..ready. It's been on my back this whole day; I can't concentrate while I play with my dogs, use Facebook, or even when I'm communicating with another person. It hurts. And I don't understand why.