2. Stress

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Stress happens; there's no getting around it. However, if you don't know how to cope with it or have too much of it, then stress can kill your relationship. There is strong evidence supporting the fact that, in relationships where there is a lot of stress, breakups and divorces are far more common. Find ways to vent, together or apart, even if you have to talk to someone – and remember not to sweat the small stuff.