Perhaps use this time to think about your idea of "working together".
You are "working together" to divorce in a friendly manner. It doesn't mean you have to spend all your time with him or fall in love again, but can you appreciate the congeniality and stay focused on the goal?
That takes serious work, but it is good work to do! It raises you to a high level of consciousness.
We are convivial AND know that we can't be married.
We can treat each other respectfully AND not be in love.
We can co-parent pleasantly AND not want to stay together.
We can even enjoy eachother's company AND not make good marriage partners.
You can do it.
His kindness and helpfulness does not erase his cheating on you or addictions.
Enjoy his good side and remind yourself constantly there are GOOD REASONS to not stay with him.
Hugs.