Not specifically that you should have been with them, or wished that you had met them first. More that you meet someone and realize that you could have had a SO that had it all together. That you didn't have to be the only income, didn't have to take on all the adulting responsabilities. There are people out there that don't have constant anxiety about every little thing, and don't need to criticize all the time. Its pretty depressing when you meet them and realize that everything you did could have been done differently.

edit: Just reread my post and it reads completely wrong. I meant to say "Have you ever met a couple that actually had their life together."