These are the factors most associated with marital separation, so they’re not necessarily causes but definitely worth exploring:
Source: “What’s love got to do with it? Homogamy and dyadic approaches to understanding marital instability” from Paper presented at the Biennial HILDA Survey Research Conference, 16–17 July 2009, Melbourne.
Hopefully this doesn’t have you too concerned about your own relationship. If so, I’ve posted before on what science has found that can improve things:
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