Should I tell my dad?

Hello !
So, last month my mom said she wanted to divorce from my dad, So the divorce procedure started around late May/early June. But I just found out that she's been with another man since January, which mean she cheated on him for months.
I don't know if I should tell my dad. I think he deserves to know, but I'm afraid I would hurt him as he still thinks that there is a chance for her to come back.
What do you think I should do?
Tell him
Vote A
Don't tell him
Vote B
Other (please explain)
Vote C
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Should I tell my dad?
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