Hatesponge
Didn't you have your own long-running thread about this a few months back?
If so and I'm not mistaken, you were given a lot of sensible and honest advice/opinions then.
ALL kinds of people use dating sites. Just like all kinds of people are "on the market" for dating in RL.
I started dating in the late 60s- 70s- yes I'm that old! I experienced single dates with men who promised to phone me next week, and of course they never did .
I suppose that OD widens the pool of possible partners at the click of a mouse, and it's easier to become more off-hand in the way you respond- or not- to people. It's no excuse for bad manners, but that's life really.
I know that my brother has had many unsatisfactory experiences with women messing him about online, and he prefers people to be honest- he sends a text. email or phones after dates even if he doesn't want to see them again- just to say Nice to meet, but don't want to take it further, good luck with your dating.
I still do think though that anyone who has been dating online for years and has never had a 2nd date really needs to look at themselves and the whole process. It's arrogant never to look at yourself . It may be something as simple as being on the wrong sites for the sort of man you want to meet, giving off the wrong signals with your profile, or being such a strong ,successful, confident person that some men feel threatened.
And going back to the OP- no you shouldn't contact him. It's hard not to feel a sense of anger and injustice when you are ignored, but being a bit of a bunny boiler isn't the answer- because you may never know the real reason even if the guy responds to your text or call.