My wife and I both came from divorced families and both carried a healthy skepticism of the institution into our marriage (which only occurred after 5 years of dating and after we were at or near 30). We've been married for 25 years and I say with all honesty that I can't believe she hasn't divorced me for some of the stupid sheet I've done - no infidelity, but just dumb stuff that made our lives so much harder than necessary (financially, emotionally, etc.).
I'm currently on Day 8 of quitting drinking, something necessitated by my doing some really (drunk) stupid sheet on Christmas Night. This comes after more than a few similar episodes over the last few years. As recently as this weekend I was very concerned I was going to be tossed out of the house - and with plenty of good reason. Under a different set of circumstances, I think she would've. I know she carries a lot of regrets, lots of them centered around pumping the brakes on her own career to be at home more when our kids were little (now 22 and 20). We are now empty nest and that's a whole other challenge. But as of now we are sticking it out and I am hoping that I can get my own sheet together enough to hold up my end of the marriage for the back end of our time together.
She was my best friend before we started dating and we've been through a lot together. I'm incredibly grateful - when I go through any of the thought exercises that come with sobriety, she is the 'higher power' and/or primary motivation that's driving it. On my own I'd be toast.