How to deal with this guy who seemingly dislikes me for no reason?

I met and see this guy through common friends, who are mostly his group of friends (I know some people in that group and sometimes get invited). Initially he was nice to me, a bit flirty. He is handsome and charming and was not indifferent to it, and I proposed him to go for a drink just the two of us to chat about some common interests. He said he’d love to but pretty much ghosted me afterwards. I’ve never really insisted or behaved differently around him after that but he pretty much stopped talking to me. I try to behave in a friendly way just like with other people of the group, as I’d like to just transform the dynamic and be friends but he is not responsive. I can’t tell if he’s embarrassed or pissed off. He won’t even answer messages and I know he’s very kind and responsive with other people in the group. I don’t know how to turn the page on this initial small misunderstanding (mostly caused by himself…) as he’s completely shutting off…
How to deal with this guy who seemingly dislikes me for no reason?
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