How do I get over my boyfriend sleeping with someone else when we were separated?

Anonymous
Me and by boyfriend broke up about 3 months ago. Two months into break up he slept with another girl. My question is... How did he go through with it if he knew he loves me? If I think about sleeping with someone other than him I get nauseous yet he did it so easily. I had been fighting for him for all that time in between. Now not even a week after being with her he confessed his undying love to me and wants to try again because it didn't feel right. I love that man so much but he knew how I felt about that situation yet still did it? Can men have sex without attaching any feeling to it whatsoever, meaning not even thinking about me while doing it?

And if so how do I get over this, I keep thinking of that night they had together. Is it even such a big deal? How do I accept that our intimacy has been broken?

How do I get over my boyfriend sleeping with someone else when we were separated?
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