If she keeps intentionally and openly hurting the MC/her husband (in the latest stripclub scene he even says she seems to be enjoying watching him squirm, enjoying causing him grief), after finding out he's innocent, that he's been true to her all along, then there won't be as much of a reason left to care for her nor whether or not she eventually cheats on him (in the very, very unlikely chance that it's all been smoke and mirrors so far on the "loyal" path) as he'd just be better off dumping her then.
MC would have to really start lying to himself to justify her behavior (way more than he's doing currently) to assume something like she's now blaming herself for believing the lie and irrationally lashing out against him because she can't bear her own guilt or something - rather than seeing her as a slut who's just jumping from one excuse to the next to justify her whoring out and keep blaming him for it to control him.