Confusing behavior from a guy I've dated? Matching changed things?

I dated a guy for about 2 months back at the beginning of the year. We got back in touch recently and it seemed to be going well. However, we matched on a dating site recently (after texting) and then he sent a message saying he wasn't talking to anyone for sometime but noted I was nice so he wanted to inform me. What's the reason for this?

If I wanted to follow up and get closure or an answer as to why this strange behavior is happening, what could I say?

Confusing behavior from a guy I've dated? Matching changed things?
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