Well, tbh, even the most loyal people wouldnt tell what happen straight up. Sure, thats for the ones who care and have common sense. Theres no way she wouldnt be even more anxious knowing he got drunk and possibly got involved with another girl. Just the situation itself is a problem when comes to trust.
No to mention she hided some major events from him too.
But learn this kids, only drink if can hold ur licor or u're in a safe environment. Alcohol literally makes people lose self-restrain either u want or dont. So better be safe than sorry