Ask @Popcornmouth:

Even if the say they realize what they lost and how badly they screwed up?

It is really situational.
Ideally, if you both can keep a level head and discuss it openly like adults, there is room for growth and understanding.
However you also have to keep in mind that they have also already violated your trust.

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+1 answer in: “Do you think someone who cheated on you once can change if you give them a second chance?”