Today i caught my boyfriend on a dating app on his phone. I asked him what is that because I saw some girls on it and knew it was a dating app. He just looked at me like a deer looking at headlights. My boyfriend didn't say anything to me what it was and exit it out as soon as I asked him. I was extremely upset and still am. I thought I could trust him and I caught him on a dating app. What should I do about this? I am really hurt that he would be on a dating app while dating me.