Random message meaning from ex's friend (please help)?

My ex's buddy/co-worker messaged me randomly. He asked how I was, I answered and asked him back, he responded with I'm surprised you answered. I asked why and he was like didn't know if you would. What would you take from this? Like why would he randomly message me like that? It's been about a... show more My ex's buddy/co-worker messaged me randomly. He asked how I was, I answered and asked him back, he responded with I'm surprised you answered. I asked why and he was like didn't know if you would.

What would you take from this? Like why would he randomly message me like that? It's been about a year. I'm confused and don't understand what's up

Thank you for your time
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