YABVVVVVVVU.
Seriously? You are asking for a kicking here.
I have been with dh for nearly 13 years. He is a great man, a fantastic dad, great sense of humour, I think he's cute as hell.. but we do have to work at our relationship.
Not arguing doesn't mean squat. We have had times in our relationship where we have been drifting because we have been too involved with work/other things and we never argue during these times. But drifting away from being intimate and being eachother's no. 1 port of call during a storm is far more dangerous than a squabble over who put the toilet seat down.
I don't really see how "life can be hard and throw horrific things at you" relates in any way to "you can control who you have in your life".
So if your dh (with no history of MH difficulties) became seriously clinically depressed following, say, a bereavement or being made redundant, would you react by not having them in your life because it's too much work? What if you lost a child? Or if you were raped? Or found out that your child had serious mental health issues/SN? These are real things that happen to real people and of course they impact upon relationships and mean that you have to work to ride the storm together.
At the other end of the spectrum, the everyday stuff also changes things. I was just under 21 when I met dh. We were carefree students who enjoyed travelling and going out clubbing together. Now we have a small son, hectic worklives, are trying to conceive and have ill and elderly parents. We have grown up together and from time to time, in the course of that journey, we have been closer and sometimes further apart. And if you spot the drift, you have to work to stop it e.g. come home earlier sometimes, surprise your partner, at the end of the day, put down the laptop with MN even though you're knackered and want to zone out to give a neck and shoulder massage because you know your partner needs it.
What's that film where it says that you're with someone a long time, you have years that are perfect and wonderful and years where sometimes you just get on eachother's goat. It's just life. It's totally and utterly unrealistic to think that you can just take your partner for granted and not put in any effort because you made the right choice to start off with
. People and circumstances change and I think everyone is deserving of a partner that is willing to make an effort to keep them happy, come what may.