Marriage is all about communication and compromise. It can be difficult to go through something alone, but sometimes it's even more difficult to go through something together. You don't get to control what other people do, and you don't get to try. The only thing you can do is try and communicate your way through it. This is sometimes easier said than done, though, when you're in a marriage and you're trying to do the best for each other. It's still easy to hurt one another even if you don't mean to. The things that you say in anger, or in frustration, can have long-tail effects on the lives of others, and if you're not careful, it's easy to slip into a place of resentment. That's the situation that this man was in when he was going through a long-term fight with his wife.
Sometimes you just can't let something go. Try as you might, it got under your skin, and now you're suffering for it. Maybe this particular thing had a big effect on the person in question, and you can't just dismiss that. You have to take each other's needs seriously, and you don't want to end up in a situation where you're resenting each other over something that could have been communicated. This is the tough part of marriage, and it's exactly the situation that this couple was in as they were approaching a milestone event.