never been married but been with mine for going on 8 years or so. Some ups and downs, sometimes we both still don't know if it's what we're going to keep doing, but it works for now and we intend to keep going with it til it's not anymore.
Not sure that marriage is on the table. Kids may be cool, but marriage for us is more of legal thing that might be beneficial for stuff like health insurance and the like.
but about the right woman or partner or however you wanna phrase it, I think there's no need to rush into anything legally binding. If they're the "right" person, they're not going anywhere so long as you're doing the work together to make the love shindig work.
Me and mine, bro, we lived 3300 miles apart for a significant portion of it. we tried the polyamory. we tried setting rules and expectations. we have lived together for the last 4 years and it's been mostly good. there have been trying times that last more than a week or even a month, but it's usually one or the other of us working out own neurosis, working out our own shit that we're projecting. That's not to say that there aren't things that drive me up the wall sometimes, and there's things I do that drive her up the wall too.
we talk about all this shit, whenever we need to. Check out some non-violent communication (NVC) resources, it's great for couples (any interactions, really)
ram dass "the yoga of relationships" is a good talk. he talks about steven and Andrea Levine kinda disappearing from their social circle for a while so they could do the relationship yoga. I may have mentioned this talk before... anyways, will you "know"? probably not, but will there be a feeling you've gotta run with, a feeling you've gotta work with, yup.