Would you give this cheating partner a second chance?

Hello,

I watched a movie Sunday night and this question comes to mind.

It is set during the second WW.
So we have a couple, Jason is a doctor and Jill, a piano teacher.

Jason had a friend (Fisher) who turned out to be a traitor, Jason became a whistleblower and managed to destroy fisher’s plans, so they became enemies.

Months later, Jason is called to the warzone and he goes.

To take revenge on Jason, Fisher targets Jason’s wife. He starts getting near her, pretending to be interested in learning piano. He uses his charms to woo Jill, she denies at first but soon they start having a passionate affair. She clearly knows it’s bad since he is her husband’s best friend (she doesn’t know about the traitor thing.). Since her husband stays away on warzone, she feels lonely which is why she wanted a man beside her.

Months pass..

When Jason comes back, he is devastated to see his wife and enemy (ex friend) doing their thing on the bed. At that time Fisher reveals it all that he doesn’t love Jill and he only did this to take his revenge on him, to make him feel ashamed. Learning the truth Jill is shocked and feels guilty towards Jason. Fisher leaves..

Should Jason forgive his wife? Does she deserve a second chance?

Sorry for the long question this time.
Regards!