Did you follow the bad directions in DB the first time you had problems with your W?

That is, did you pretend that you didn't care, that you acted happy all the time, never let her see you hurt, did you not chase or pursue, that you pretended you weren't hurt?

Basically, did you lie and act in a way that you thought would be what your wife wanted instead of being honest with her?

If so, stop it. Tell her that cheating is unacceptable and you won't stay married to a women who does.

But for that to work, you honestly have to believe that you are worth being loved, singularly. If she doesn't want to do that, what do you have to lose? Is being with a women who doesn't respect you really a bonus?

Once you figure out why you don't think you deserve a faithful wife, everything else will fall into place.