Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: Me and my girlfriend have been in a relationship for almost two years. She went to study in a different country and we only see each other a couple times in a year. A few days ago she didn't answer my messages until late in the night when she told me she would go to sleep. The next day I found out she went to the club instead and lost all her memories about it. When I ask her why she lied to me she tells me it was because of the alcohol, but I don't think alcohol can make you do that without a real reason behind it. She knows nothing about what she did, but somehow she does know that she didn't do anything wrong or cheat on me. I'm sceptical about this, because how can you be sure if you literally know nothing about your whole night. 

She has always been a very loyal and trustworthy person and had no reason to lie about this, since I have been trying to motivate her to go more outside and do stuff with friends. I'm not mad at her for having fun and I want to trust her really bad, but first lying and afterwards somehow coveniently losing all memories about it just seems a bit too suspicious. I've brought this up multiple times with my girlfriend, but she gets mad at me instead for not trusting her and she suggested taking a break in our relationship. 

So AITA for not trusting my girlfriend? 

not trusting my girlfriend anymore after lying to me and conveniently losing her memories