How to get over something my girlfriend did in our relationship?
I had been with my girlfriend for almost a year and a half at this point. I am a Muslim and therefore don't drink; however, my girlfriend did drink at this time. I am a big worrier; however, this did not bother me as she rarely drank and when she did she was responsible with it. Before we both started university she convinced me that she would never get drunk. I thought she would but she said she wouldn't so I trusted her and believed that she wouldn't. However she did.
This came as a big shock to me. Since then she decided she would stop drinking and it wasn't until this that I told her how I felt about it. We talked about it and she was very understanding and reassured me that it wouldn't happen again anyway.
But my problem is that I can't seem to accept the fact that she knew I am a huge worrier but still went ahead with it. I stayed till 4 that night because of a text she sent me earlier in the night saying "I think im drunk haha". So my question really is how do I get over this break in trust as I trusted her completely when she said she wouldn't but then ended up doing so regardless?
All I want is to get past it and not relate anything to do with alcohol to this situation as I can understand how petty and selfish it sounds. Also we are both at different universities.