Welcome Kmk2122: I'm so sorry about the difficulties you are having with your wife. Cheating is a disturbing situation to deal with. This is a good place to vent and share. There are others here with similar situations. Interacting with other here and exploring some of the lessons, while in therapy, can be a winning combination.
There is a large green band at the top of this page. One of the menus has a "Tools" title, that can be a good place to explore, as well as the links to the right of this post. Obtaining or refining Boundary and Validation skills, can be a good place to start. With setting boundaries, and using some communication skills, it can make things better for you. It can take some effort, but it can lead to some good results.
Other than cheating, what are some of the specific problem behaviors you have to deal with? Sounds like there is a problem with stabilizing her mood, and perhaps too much sleeping?
We look forward to hearing more of your particular struggles in your relationship, when you want to share more.