If you are looking to another person to entertain you, then that is the issue right there.
So true.
None of us enter a relationship planning to be the one enduring an industrial accident. We react to stories with, "Oh those are the people who get amputations," as though we are immune to life's trials and other people are supposed to take them on. People can get boring, but life is seldom boring. BFine, thank you for sharing the difficult times you went through. It must have been so discouraging, and taken a lot out of you.
If a couple is too focused on the relationship, and ignores the life around them, then they have plenty of reason to get stagnant. We all need to grow and learn new things, develop skills and outside relationships.
If a couple limit their attention to each other, then they only have the content of what they already know, and the experiences they have had together. Nothing left to talk about, bc they were both there. But life has plenty of things to explore, and the two people can come together to share their outside adventures.
I think the key to long-term sustainability is to take the focus off the relationship. Don't spend time weighing whether you are good together or not -- just keep going forward in life, sticking to prior commitments. You don't have to like a person every minute of the day, or agree with what they've done.
If you're bored with your spouse, call up a friend. Don't rely on a spouse to provide all your happiness in life.