Really, the reason for marital breakdown does not matter. We can suggest that OP tries a year of counseling, with or without his spouse. Even if OP does not want to be married anymore, and the marriage cannot be salvaged, it is good to have counseling before, during and after making a decision of this significance. There are divorces that result in bitter situations that are awful for the couple and even worse for the children, and divorces where things end amicably and effective co-parenting is possible.
But OPs question has been answered. He will likely be paying alimony, child support in NY goes to age 21 and is largely formulaic. NY is an equitable distribution state, which means assets and debs will be fairly shared. OP may be able to retire one day -but needs to keep his child support and alimony requirements in mind when he does.
If OP thought divorce would make his life financially easier, he is very wrong.