How Do You Know?

How do you know when someone loves you?
I’m talking about when someone is “in love” with you rather than “loves” you.
The only criteria that I have, and it’s not very good, is if she does more to express her love to me than I have then she is in love with me.

When they are willing to put up with all of your bad habits, ill manners, and other unpleasantries and still take care of you.