AITA for blowing up on my gf for hiding a snapchat account from me?

for context we had both agreed she wouldn’t have one anymore after she used it to cheat on me with 2 different men while she was drunk in the beginning of our relationship.

i found it on accident and i did ask for the password which she reluctantly gave me and when i went through it she tried to hide that she was speaking to 2 different guys which led to her and i arguing however according to her she’s not cheating on me.

i feel like im insane because she won’t admit she’s done anything wrong or just be honest w me in general it feels like im going insane