This is a sign of caring for you. If she doesn't care about you, she still cares about you. Besides, she may be a little jealous.
Generally, there is 1. I care about you. I still have feelings for you. 3. I am jealous.
These points will be more or less there.
This is my answer (it seems that you also care about your ex-girlfriend, O(∩_∩)O~)