FB is apparently the free app for married men/ sleazes to test the water.
I’ve had it numerous times and I too was polite in responding in benign ways.
It really rattled me when each married man would message late at night, based on what they’d seen on my profile, pics of me on nights out etc.
I stopped being polite, removed, blocked and used judgement on whether messages were genuinely friendly or sniffing.
I’ve not had a stalker, yet it made me adjust my posts and think about what it was attracted them and made them think it was OK to do so. I don’t get it now, but for a good year or so after separating from DS’s father it’s what happened a lot.
With hindsight, these blokes had always been players and it was inevitable - I’m hardly Beyoncé.
But I was offended and got really angry after about the fifth because the assumption was I’d be flattered and gagging for the attention - despite the fact I’d just been cheated on myself. Cheating men - even wannabe cheats repulse me and always have.
I think this would trigger you OP and make you feel pretty uncomfortable given your history. Just know that it was probably him chancing his arm, he saw you once and thought you’d be flattered. Because he’s a prick.
As for his wife, I’m sure she must realise he’s not trustworthy - probably knows he has a roving eye. I’m not sure I’d send the message as it would prolong the ordeal.
Put it behind you and accept it brought up a lot of uncomfortable memories and I hope you find some equilibrium. There are a lot of chancers out there who do this and thankfully, they’re not all going to take it further and in this instance, he can’t anyway.
Best wishes.