Why do guys grab your waist?

We were walking up the stairs and there was a moment where I got tired so I stopped. This guy was a little behind me, when he catched up he used one arm and grabbed my waist pulled me close to him so we could continue walking. After a little while he stopped. But some minutes later I grew tired, stopped and he did the same thing. We were alone on those stairs. Is this is a sign that he likes me?

Why do guys grab your waist?
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