How can I tell him without him knowing I was the spy sitting in a car for hrs.

How do I tell my boyfriend I know he cheated, without him knowing I
was spying on him. He hates High School Drama,
I sat in a car for hrs. while he drank in a bar with the girl?
i CK out his house to find out what time he got home & he stayed
out longer than he does w/me? He needs to know I know and won't put up with it> I hate liars, plus this was our nite together


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