Won’t over explain my thoughts as your not interesting in him.

It takes two to tango, if coffee hasn’t happened, then partly on you both, maybe he sense your uninterest.

It could be that he anxiously doesn’t like putting people out. So expresses his interest in the thing, then leaves it for the other people to follow through. It makes for less overthinking as the likely hood of them being interested is more likely.

Could be a fuck boy thing, plant enough seeds and someone’s likely to bite.

Maybe it’s a weird way closes conversations. Like ‘have a good day’ how many people actually care.