Trying to decide if you want to be in a relationship is a tough one.
Being alone and learning to love being alone is one of the most freeing feelings in the world.
I love "me" as a single person as well. When I was single I did so much more with myself, my anxiety was also a lot less because I had only me to worry about.
Don't rush back to any relationship out of bordom. Love is a beautiful thing, but falls very low on the scale of a "functional" relationship.
If your husband is saying he's going to change, it's more likely than not he's going to try to change for you and not for him, in which case he will resort to his old ways in no time. It takes YEARS for someone to change and a lot of hard work.
You can still love your husband and not be in a relationship.
Take your time to make this decision. It's all about you, not anyone else.
The world breaks every one and afterward many are strong in the broken places