He is going off me

I don't know what I did wrong, but I can feel it happening. We were so close and he was so affectionate and loving. I felt like I made a friend who would never let me down. How naive I was. Now that's all disappearing and it hurts. I don't feel like I can talk to him either because of our specific situation. It's complicated but it was real and now I'm losing it. My heart hurts. I just wish I knew why