Relationship blues

I need advice. I want to save my relationship but idk what to do. My boyfriend doesn’t know what to do either. I know he loves me and I love him but he’s having doubts and it’s all my fault. We had a conversation a while back about stuff that needs to change and we were great after that. Well, now we’re not okay. I keep doing one of the things I said I would stop doing and he’s upset. He said he doesn’t know how he feels right now. We haven’t spoken much these last few days and idk what to do. I want us to work and I’m trying to change but change doesn’t come instantly and he’s not understanding that. I just don’t know what to do and I’ve been crying and not sleeping, not eating and I feel hopeless and sick.