What does he want from me and why me?

This continuous behavior has been happening since 2016. We hardly talk to each other (very short/ dry) conversations. He’s always quick to look at my Snapchat or Ig stories, always comments on my stories or sometimes messages me to check up on me. Why put all this effort if he’s always acting hot and cold. We have known each since middle school but went to different HS.
What does he want from me and why me?
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