A question about crying and love?

Is it weird that the last time I cried, it was about a year ago, and it wasn't for myself, I felt really good about myself, I cried because I could see the pain and fear in everyone around me and I felt like their pain became my pain, and their fear became my love.

I feel like I should have plenty of things to cry about, I was great at crying when I was a kid, why does nothing seem to cut me anymore? Crying felt good. I wonder if perhaps my heart is too cold and closed. Perhaps it is when my heart is open and warm that my mind is at it's healthiest? If so then how do I open it up? And how do I warm it? Is that what happens when you fall in love and are loved back? You have someone you can always rely on to keep your heart open and warm?