How do you deal with the fact your LTR has gotten down and dirty with lots of other dudes.

I am curious as to how you can understand that she has literally been on her knees sucking some nigga dry, maybe tossing that salad a bit and that you still want to be with her? I understand we are human, everyone has multiple sexual partners and does kinky shit. How can i get past this strange ideal i feel? Even woman with low n counts have sucked dick. Even to understand that your LTR WILL have sexual thought of others when with you (regarless of actions)

I feel like its impossible to get close to a woman understanding that they are all "unpure". I understand this is unrealistic, help me be ratuonal about life.