Possibly not TTC anymore?

My "fiancé" and I got into our first serious fight today. Not sure if he's going to want to keep trying. It really scared me because I never would of thought we'd EVER bring up breaking up with each other but he did today. The fight was my fault for the lack of effort I've been showing...like cleaning up, not working a lot, just sitting around, and being a bumb. I'm fucking things up and idk what to do. I told myself I wouldn't be such a bumb anymore so I guess I just have to prove that to him. I know he loves me and I for sure love him but I don't want my heart to hurt anymore.