Why would a casual partner suddenly bring up past relationships and being single?

I met this guy nearly a year ago and shortly after we met we decided to be casual but I can tell something deeper is starting to develop/form. We hung out Sunday night and I pointed out that it's been almost a year since we met. He said really and we both said it didn't feel like that long and were talking about what years sucked for us. Then he said he hadn't been in anything serious since 2022 and I said I hadn't since 2023. He said that the only serious and emotional he got involved with was his job since he opened up a business. I spent the night and the next morning I brought the convo up again and asked him when his last relationship was. He said 2022 again and then said something about being fucked and I asked how. He basically just said that he's gotten used to being single and having his own space. I thought it was a little weird that he made the relationship comment. Couldn't tell if he was trying to see what I would say or if he was just making conversation. And yes I will talk to him, just wanted to get some opinions first.

Why would a casual partner suddenly bring up past relationships and being single?
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