How do I know I miss her?

I know I miss Michelle because
1. I dream of her
2. I look through old emails from her, just to reminisce how it feels to read an email from her
3. I look at ther FB account, although it is definitely, absolutely not active anymore.
4. I put a photo of her at my desk and take a peep at her occasionally.
5. I look at all the pictures we have taken together.
6. I get the sudden urge to press her hp no. on my mobile.