What would you do if you find out that your partner is cheating on you?

More specifically my father is cheating on my mom and i somehow found out that. I haven't told my mom yet cause i fear that they may get divorced because of it. So if i just ignore it, will everything get okay with time or should i tell my mom. I mean so many problems will be created (like financial, accommodation) if they get divorced. and if i don't tell my mom then it may seem like deceiving. Hope someone can give me suggestion

What would you do if you find out that your partner is cheating on you?
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