Where did these tears come from?

I sat watching a movie on tv this past Sunday. I won't tell you which one it was, but lets just say that it was one I was glad I was watching alone.

The female lead of the movie was wondering where the sparkle goes after you've been in a relationship for some time and how does it get replaced with...comfort? Dullness? Complacency?

The the male lead does something reminicent of the past. He calls her on the phone, tells her to get ready for dinner because he is taking her out and that if she looks out her window, he is waiting for her in his car.

For some psychotic strange reason, I start crying. The tears were streaming down my face from both eyes like a water fountain.

What was going on here? Why was I crying? He wasn't waiting outside my window to take me out, this was just a movie.

I came to realize that I was mourning a relationship of my past; one that was full of romance and "sparkle". He would show up in the middle of the night with surprise phone calls. We would wander the streets of various cities together and he would surprise me with lemonade, cookies and marriage proposals.

All of this emotion pouring out of me left me thinking, when does the emotion disappear? How long do you mourn past loves, past lives, past romance? Does it ever go away?