Why do exes check up on you after a breakup?

Anonymous
Me and my ex have been broken up for about 4 months. He texted me yesterday just to "check up on me".
I don't trust his motives. Was he possibly trying to play mind games with me and get me to believe that he misses me or something?
I replied coldly but i want to gi back and ask him why he's checking up on me.
We had been in a sort of situationship situation for almost 2 years and broke up because i was sick of his games. I do really miss him amd since he texted me i haven't been able to get him off my mind.
What should i do
I believe he knows I'm the type of person to go crazy over deciphering the meaning of a single text but I'm not sure...
Why do exes check up on you after a breakup?
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