Reddit men, how did you find out about your woman cheating?

Found out through Instagram. And man when I saw that picture, I was hurt. I cried. I cried my eyes out. I cried my heart out. I never thought I’d ever be cheated on. Never thought it could happen to me. I did everything for her. I was on my phone at the time when I found out. I had just woken up and started shopping for purses for her when my side chick turned to me and showed me an Instagram pic of my girl kissing another guy. My heart sank. I felt so betrayed. How could she do that to me