Well, good luck to you then.
And many of us on here haven't had infidelity just not great marriages that we have used MB to make them great marriages. I haven't had infidelity in my current marriage and at one point was dealing with a lot of the same issues you are. Not anymore.

Regardless if you think there's infidelity or not, you're going to get resentful about your needs not being met and it's going to poison the marriage. But that's up to you if you keep allowing yourself to be a doormat. A doormat=she basically does what she wants, says what she wants, and dismisses how you feel or what you need and you support it while you're just meeting her needs.

Husband (me) 39
Wife 36
Daughter 21
Daughter 19
Son 14
Daughter 10
Son 8 (autistic)