Why did he text me after no contact for 4 years?

There’s a guy that I used to be close to in hs. We never dated, but there was a certain level of interest. After awhile, we lost touch when he moved away. Over the years we’ll lose contact and then one of us will message the other and we’ll talk for awhile before it happens again. I’m really confused by this pattern. Any ideas?
Why did he text me after no contact for 4 years?
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