I'm 23, Male, living in DC. I met a girl on instagram about 5 months ago. She lives in London. I was hesitant to try long distance but I gave it a chance because I like her. Things were going great at first. I even flew her out twice in the past 2 months. However, I found out that she is cheating on me. One evening, I asked for her phone to call my mum because my phone was dead. Then I saw a notification saying I miss you. I clicked on it and saw the entire messages. I was shocked. I felt like throwing up. I did not react in front of her. I just kept quiet and gave her back the phone. I then texted the guy she was talking to on my ig and he told me that they have been talking for 3 months. I cried. I felt betrayed. I love her but I do not know what to do.