Okay, to start this off I will say my girlfriend asked me two specific things when we first got semi serious, “Don’t cheat on me” and “Don’t do drugs” honestly that was no problem, the reason this was even brought up is I have an extensive history of smoking weed through my freshman year of my college but I had quit a month prior to us meeting. (We’ve been together 4 months) Anyway, yesterday my buddy who is leaving for the Air Force in 2 weeks wanted to get high one last time before he went into the military. It just so happened my girlfriend was at work for the next 5 hours so we went and got high. Well one thing leads to another and I go to my girlfriends house and everything’s fine. I get home to a text asking if I smoked weed tonight, and I straight up told her the truth that I did and gave reasoning. She said she smelled it on my breath then she proceeds to threaten to break up with me, calls me an idiot and makes me feel overall just incompetent for the next hour, telling me how much she hates me and how much I’ve hurt her. Granted her deceased father was a drug addict and it explains her negative feelings towards the situation but AITA for doing it and really still not feeling like it’s that big of a deal?