There was once a really fun guy who would hang around me, court me but I saw him as a puppy. That he was happy for whatever attention I bestowed on him.
Imagine my surprise when one day I find him not only having a great time with other women but not paying attention to me! I was shocked but chose to maintain my dignity. The thing is, that guy was hilarious and so much fun. And I had to work to get his attention.
Finally I asked him what made him change toward me. "I figured that even though I liked everything about you, you weren't interested enough in me. So I changed my focus." Needless to say once I won his attention back, I never took him for granted again.