How is a person supposed 2 deal w/ After 15yrs in a association/relationship w/ kids finds out 9+yrs of cheating&gaslighting be accepting and let go?

Like it says up there, but was told the if this was to work I'd have to let go of the past and forget about it if i wanted anything with her...
How is a person supposed 2 deal w/ After 15yrs in a association/relationship w/ kids finds out 9+yrs of cheating&gaslighting be accepting and let go?
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