I imagine this happened during a time when he was floating between "laps", so to speak, so he wasn't really sure what to do with himself. Maybe it was boredom. Maybe it was a recognizance of self in another. I always imagine he bought a hotel room for them all n they just chatted for a while, which is how he recognizes Queen later in Wano.
Maybe he was lonely and just wanted someone to talk to. It's hard to say, he's a bit of an enigma like that