What does it mean when he randomly starts talking with me?

There is this guy at work who I never talk with, but i’m trying to be more social so I decided to try with him.

We will leave doors open at work because it gets hot during summer and sometimes animals will come in, I caught a frog and showed it to him but he seemed kinda bothered so i felt bad

But the next day he asked me what happened to the frog, does that mean he's interested in talking with me? He could have easily just ignored me. I have tried with him before and this was the first time he asked something back, and most people would forget the next day if they really didn’t care.

What does it mean when he randomly starts talking with me?
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