Don't even try.
You need to be supportive of one another, but you are individuals with individual problems.
You are not likely to be ready to improve at the same time, nor to respond at the same rate. Tying your improvement to his, or vice versa, compromises both.Each must get strong/well for the relationship to be healthy. But when the 1st one improves, the other has a better chance. Just get started on yourself.