Relationships take work. They take tolerance, and a bunch of other things. Psychologists actually know an awful lot about the characterstics needed in order to stay together. I know a couple of them off the top of my head. For most couples that stay together, the have a way to quickly defuse arguments (a joke will work), that works for you both. You also are likely to need to have a ratio of six good things to every one bad thing in your relationship.
There are many others, and a number of websites online where you can get this information. Some of them will try to sell it to you, but you can glean enough from the free stuff to understand more about this.
If you don’t have these things in your relationship, there is good news. You can learn to do the right things, and you can change your relationship into one that lasts. Here’s another one I remembered: men need to give most women a lot of little things for them to feel loved. All those silly remembering things, like anniversaries and birthdays and surprise gifts and flowers help a lot. As does saying I love you at least twice a day. If you do these things, the woman will feel loved and be more likely to do the things you want in order to feel loved. You know, those bedly things?
So, if your relationship is not doing well, therapists teach you to do this stuff. Guys are often reluctant to go, perhaps because it is a sign of weakness to be unable to solve your problems on your own. If you can’t get your guy to take the relationship seriously enough to get the help of a professional, it’s not good. Actually, marriage is probably not something amateurs should engage in. Unfortunately we’re all amateurs in our first marriage. We learn on the job.