How do you know if someone is being friendly or interested?

I usually just assume someone is being friendly/considerate. There's someone I met through a friend 1 year ago, and he's very friendly and social. We started talking more recently.

I have a feeling my friend told him I'm very shy with people I don't know that well, because whenever we're talking, it's like he saved all of the questions I asked him through text and shoots them at me to make me talk more. "I remember you mentioned [topic], what did you like about it?" He also always tells me the reason why he's replying late while he doesn't have to or tells me about funny anecdotes when we talk. And some of the information he knows about me is through my friend because sometimes I'm like: "I can't remember I ever told him this".

"Let me know how it goes"
"Hopefully we can play again"
"I'll let you know when I try"
He always makes sure I feel comfortable and is really helpful.

Some of his friends came over, but he asked to game together, so we ended up talking while they were in his room as well. I found it a bit funny cause we could ways play/call another time
Friendly/Considerate
Could be more
Interested
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How do you know if someone is being friendly or interested?
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