In regards to single line emails, it is uncomfortable to write more on phones and that seems to be the dominant way many people use the Internet these days.

It is an old lament that people forget that there human beings on the other side of the text on the Internet.

My theory is that phones make that worse.

People now have this little box that they can type stray thoughts into, like a confessional in their pocket or an emotional spittoon.

This is probably even more true now that you have a generation of adults who have grown up communicating via text messages.

That is the foundation. On top of that add that guy's conflicting interests and fears of visiting a professional dominatrix and you get the annoying cryptic messages you have been getting.