What does it mean if a guy says he is just "checking in" on you?

HidingMyHeart
At one point we were seeing each other, but it had never really gone anywhere. That was the first time I've heard from him since he came to say goodbye to me before I left school for the summer. This was over Facebook chat last night and it's the second time he's said that since we stopped seeing each other a few months ago...
What does it mean if a guy says he is just "checking in" on you?
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