u/Due-Bit-3210

So I had a flight next to a guy who I barely spoke to, but there was a lot of smiling and we were kind of leaning on each other and touching arms for a lot of the flight, he smiled at me after he went through customs and walked off, I can’t stop thinking about him… he had his phone open angled my way before we got off the flight which had his name on it and I found him on Instagram, I am just unsure if I should forget it or give him a follow but how do I even explain that? I could have gotten the wrong idea but it seemed intentional.. advice?