[2ND UPDATE] I [26 F] went on a date with a guy [??M] who turned out to be married, do I tell his wife?

Original question

First Update

I decided not to wait on telling his wife about what he's been up to, so I wrote her a message that, admittedly, was quite long because I wanted to tell her everything up front, and sent it to her via Facebook. I tried to pay the $1 to send it straight to her inbox, but something funky happened with the transaction and I don't think the transaction went through. In any case, the message was sent at exactly midnight on Sunday night, and it's Wednesday and she hasn't responded, nor is there any indication that she's even read it. I'm worried it went to her other inbox which she may not check.

At this point, is it worth trying to send her another message, this time definitely paying that dollar, just to ensure she knows what's going on, or is now the time to drop it and walk away?

TL;DR: went on date with guy, date got slightly intimate and there was a suggestion of more intimacy later in the week, found out he was married, tried to tell the wife but I'm worried the message went to her other inbox and I need to know if it's worth another attempt to message her.