What is a hall pass?

Anonymous
My babies daddy and I were together for 4 years but I decided I needed a break, so we took a break for 4 months. But when I finally realized I wanted him back and drove to his new house and knocked on his door. A woman answered, and told me she was his GIRLFRIEND. Not only has he been cheating on me while we were on break, but also, he now lives with this girl!! His excuse was that i gave him a hall pass. What the hell is that?
What is a hall pass?
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