Found stuff my exgf sent to another guy and stuff they did, I got really horny...am I a cuck?

Recently found a drive I used to share with my ex, she prob forgot I was also using it and found some stuff that are from when we were together, I saw a lot of hot pics that I never saw before, posing like they were meant for someone, then I saw a vid of her sucking another cock with a very alutty face, deepthroating him like she never did to me (and this guy was bigger), I started fapping without realizing and the moment she got cummed on her face I couldnt resist and busted while my heart was racing. Never confronted her about that since we are no contact, but what do you think, could I be a cuck? Do you think its ok to fap on her cheating on me?