My ex (who I broke up with 4 months ago because of college) messages me from time to time. I usually keep my replies brief. However this time I wanted to do a little experiment. I have replied to her texts, and opened her snapchats. It's been 3 days since the first message. She just messaged me of Facebook "Hey is everything okay?". I will be seeing her soon because she will be back from school and we are family friends.

How should I proceed?