Is he being friendly or is interested?

I did have lunch with a former primary school classmate who I have not seen in 15 years.

We were young then and ofcourse we remember one another from then and now, it's just strange to see one another evolved.

We did reunite, since a classmate of ours made a group chat while we both decided to see one another.

We did ask how each other were after all these years.
When it came to asking about a relationship he said he currently had someone.

He did pay for our lunch and he told me I can cover next time.

Our conversations were alive with intervals of joking, reminiscing, sharing, talking.

Is he being friendly or interested?

I am interested in him and the fact we knew one another as we were younger, but I cannot make a move since he currently told me he has a girlfriend.

But it did make me notice why he bothered despite having a girlfriend.

Could he be interested too but cannot make a move? Or maybe he is only being polite.

What should I do.
Is he being friendly or is interested?
Is he being friendly or is interested?
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