While that is certainly possible, I wouldn't argue it's required.
Consider a couple that is living together. They might be unhappy, but bearing it anyway because they have a lease and moving out and separating all your stuff is a pain in the ass. However, once that lease comes up for renewal, suddenly the burden of breaking up isn't so heavy, which might be just enough to make it happen.
What I was proposing for marriages->jobs is analogous.