In the documentary "George Harrison: Living in the Material World," Olivia (his wife) was asked her secret for longevity in marriage. Her answer: "Don't get divorced."
I pondered that one for awhile. She hinted that he'd been unfaithful to her at times, and they weathered those instances together and reaped rewards for it. I found this edifying.
The fact is, as most of us can attest, the "spark" is a tidal kind of thing after many years of marriage. It ebbs and flows and, frequently, you have to work at it. You have to make the effort to sparkle a bit for your spouse, and take the time with each other to allow it to relight the landscape. It's a given.
My mom used to counsel me on this a little. She'd say if you have fallen out of love, you need to fall in love with him again. If you can allow that it is possible, it can happen. She was right. It happened several times thus far in my 40+ year marriage.
I don't propose that anyone stay in a relationship that is abusive and demeaning, but I am staying that people frequently toss out the baby with the bathwater and their kids suffer for it.