What did he mean by "whos the lucky guy?"?

so this guy that I was seeing before texted me last night after a month of not talking.. and he asked me how I've been, etc
and then he asked me:
"are u still single?"
and i said "maybe... why u ask?"
and he goes "idk just curious.. so whos the lucky guy?"
What did he mean by "whos the lucky guy?"?
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