Arty.
In my opinion if the contact stops, it's a matter of them not being interested, reasons vary.
The only thing you can do is move on and not dwell on it.
I realise this is probably hard to deal with, but you need to find a way or it will just continue to depress you.
Personally if i cease contact with a guy, it's because he bores me or comes on way to strong from the start. And Im not saying that's what you do, because I don't really know.
I love talking to people but if they hound me and expect my attention all the time, it's a turnoff and again these are my feelings only.
You can only keep your head up Arty maybe review your approach. Not sure Arty.

Just keep happy.