Missing my ex

My ex and I have been broken up for over 2 years now. We have periods where we talk off and on as friends and sometimes more than that. Right now we aren't talking.
My ex makes it obvious that he checks my social media by posting similar things as I do soon after I post them and stupid stuff like that. We don't follow each other and this has been going on off and on for about 2 1/2 years now. Usually if he does this it means he misses me or wants me to know he sees everything I post, but I'm not sure this time since we haven't talked for a few months. 
I don't know if this means he still cares and misses me or if he's trying to mess with my head and play games. He rarely texts first and in the past he shared with me he missed me but was too scared to text me first and I don't know if maybe he's in that same position again.
Do you think he cares and wants to text me? Or do you think he's messing with my head and playing games and I should move on? He is a year and a half younger than me if that matters (he is 15 I am 16)