Son compartido

I just found out my girlfriend cheated on me… Two years ago. And I don’t know what to do. We’ve been together for almost five years. She’s my first girlfriend. So this isn’t just some random relationship to me. Today… Everything changed. A guy messaged me. He told me he knew my girlfriend. At first… I thought it was nothing. But then he started explaining everything. They met at the gym. Started texting on Instagram. Then one day… They went out together. She never