Confessing to My Boyfriend

My boyfriend and I have been together for a long long time. Years. Over the years we have both hurt each other. The relationship seems toxic but we both love each other and are willing to work things out. We want to. However, I think if I want to do that I will need to come clean about some things my boyfriend doesn’t know about. I want to start fresh and put everything out there. But that could mean I lose him for good because who knows if he’ll want to work on things after what I tell him. Part of me needs to tell him the truth because I feel like it’s the right thing if we are deciding to give things another try. But part of me says that I only want to tell him to get it off of my chest and not live with the burden myself. That telling him is actually selfish because he’ll me more hurt and I would feel better about myself confessing.

Thoughts?