I was grown up with the idea that "no sex before marriage" and so on. Shesh. Me and my ex which I still have with her allowance full sets of keys to her house of, never considered marriage nor engagement wows. Because all our friends getting engaged split up within a couple of months!
Last summer we where supposed to maybe marry, and my father worked as crazy to renovate the 1926 model T-ford for our wedding, and then on spring we simply told him we're separating. I thought he'd have a stroke. But we simply needed the separation. If not, because of keeping sane.
Having three kids that requires 25/7 (yes, 25/7) maintenance and monitoring kills a relation by time. We moved apart, live separately, have the kids about "whenever they feel for crashing in" to lease stress (having 3 NPF children with severe allergies and authistic parts drives anybody crazy that doesn't have the stamina to either cope with real life or lands on drugs)
We was together for 19 years without marriage, and I still can freely walk into her house and she into my apartment whenever she wants. And SHOULD there be any company in bed, so what. We're separated, We know both how life works. But we have three kids together which is darn important to both of us. And THERE people start to get problems understanding our relationship nowadays after the separation.
It's not that neither of us jumps to every bed available or something, We have to keep in mind both the other and our kids, and starting a new relation is never easy, because you always have your kids in mind. I've seen so many bad separations over the years that just ruined everything. I have kids, that loves to live with me and their mother and find it quite nice to have two separate nearby places within walking distance to crash in. Especially when the other kids goes chainsawing on nerves it can be a real haven for one or two to just walk home to me.
It's just that I hope when she gets a new guy he understands that she's got a janitor that probably have to give her intimate checks due to three troublesome births with a lot of scars, give her massage to straighten her spine after the pregnancies, and that I'd never ever walk into her bedroom no matter how many shoes I have to showel up. Thankfully she's of the same opinion for me. Well, except that I've supposed to have a female company..