Feeling unworthy..

Narcissist ex contacted me after months, he was asking me questions, in general he was trying to open any subject with me, it was so obvious.. I think he contacted me coz he saw that I got successful in my life and things are going well with me ...

We texted for 3 days and he stopped replying to my text suddenly.. he didn’t even check it... at the same time he’s showing me that he’s posting pictures on the status but ignoring me.

Why he’s doing that?