It looks like a proposal mail, full of emotions. Being an entrepreneur, totally understand the point that a co-founder is not less than a spouse.

IMHO even after reading this, he/she does not want to continue, you should stay separate for good & concentrate on the venture. Co-founders are like boyfriend/girlfriend, you dont look for one, but find one on the way :).

Wish you, your co-founder & the venture - best of luck.