How do you become intimate and sexual with someone again who left you? ?

Knowing they made love to someone else and got what u lost out on. How do u do that? I know some people do but for do y'all do it again with them without the traumatizing thoughts of what they did in bed and the fact they made love. How do you not let it get to y'all? I have an ex who cheated on me with another girl and he came back so how do I sleep with him again or be accepting that he made love to another woman. I'm frightened to death to. Any tips? I have mixed feelings part of me wants to part of me doesn't.
How do you become intimate and sexual with someone again who left you? ?
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