I saw a guy on the train and we had a connection, we both chickened out, how can I find him?

So I sat opposite a really cute guy on the train, we smiled and had long eye contact. I got off the train and smiled again at him … he got off just after as if he was following me, I pretended not to notice and he chickened out and got back on the train :( how can I find him in the whole of London 😂 I sort of know he may of been headed to the final stop of the train which is a busy national station he had a big bag

I saw a guy on the train and we had a connection, we both chickened out, how can I find him?
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