To talk about the connection you had with that person. I think that's is exactly why it is so special to meet with people online is that you can open up fearlessly and have very deep exchange super quickly while still being total stranger. So you get theses very unique interaction you'll most likely never have irl. It's quite common i believe. It happened to me and i know other people it happened to them as well.

I think it's interesting that on website/apps designed for dating and meeting, all the exchange i had were very poor and shallow, the best place for me was actually lastfm before it became a ghost town.