How would you react to this situation?

I just had the weirdest experience I think I’ve ever had!! (sorry it’s a little long)

So I sold some movies online and agreed to meet the woman at a local coffee shop to sell. I arrived a little early got a coffee and sat near a window and started playing with my phone wile I waited.

Out of the blue a guy walks over and starts talking to me…
Him: Have I seen you before?
Me: I doubt it.

I expected it to end there I get that alot for some reason Then he keeps going telling me a bunch of things that I responded to with “ok”

Then tells me he came over to talk…
Me: why?
Him: because I was sitting there alone….

During this whole conversation every warning system in my body was screaming.

Was he trying to be nice? Was he hitting on me?
I have been hit on by guys and girls before though it was different
I don’t know what to make of this…. Any ideas?