How do I make my boyfriend happy?

Ashly
My boyfriend and I have been together a little over a year now and things are just falling apart. I don't know what to do. I'm completely in love with him and he has told me that he is just not happy anymore and he doesn't know why. He loves being in the gym but he has recently been restricted into doing so my his cardiologist. But even then, he should still care about me right? All I want to do is break up with my boyfriend and start dating my best friend but 1. They're the same person and 2. I think we're losing our friendship as well. Whenever I think about life or being happy, I just want to cry because all I can think about is him not happy with me anymore. I don't like how this relationship has been going but there is a gut feeling of hope that I think I should hold on to. I just don't know what to do 😔 Someone please help me 😞😢😓