I think my mom is cheating on my dad.
Why do you think your mom is cheating?
I've found some unusual financial transactions. My mom has some unexplained expenses that she always takes care of.
While I understand you concern, I don't think it's good for you to try to figure out what's happening between your mom and dad. Their relationship is their business, not yours, so I think you should stay away from it.
Did you even listen to me? I can't keep this to myself! She's been going on vacations to Hawaii without him.
It definitely is quite stressful to have these suspicions, but you shouldn't be playing detective when you don't know what's really going on between them. How about asking your mom what she is doing, it can easily be a funny misunderstanding!