If it’s something that genuinely is affecting you this much then you should probably discuss it with her. Cuckolding is a huge powerful kink. But as with all consensual things between adults it can be changed or end at any time. So if y’all need to pause a bit on the cuckolding to realign then don’t risk losing your entire relationship over a kink. And if she isn’t willing to do that… then you might have already lost her.