Girlfriend sent pics to another guy while drunk?

Anonymous
So my girlfriend came to me this morning and told me some pretty upsetting news. Last night was her first time drinking and she got drunk. She was snapchatting a guy who has a reputation of being a fuckboy. She ended up sending him a picture of her boobs. She claims she only remembers sending him a picture of her boobs and she thought it was me it was going to. She doesn't know if the other guy was drunk either. I'm confused on what to do. I feel angry that she did this to me, drunk or not, but at the same time I feel compassion because she was drunk. Any advice?
Updates
+1 y
She blocked told guy on snapchat before she even told me about the situation. We have been together for almost 4 years. She has his snapchat because she is on the swim team with him and she thought he would be different since they were friends. The guy knows me too, I wouldn't say we are friends but I am nice to him when I see him.
Girlfriend sent pics to another guy while drunk?
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