In ny what are the reasons to get a contested no fault divorce?

Irretrievable breakdown in communication between husband and wife for at least 6 months.

You can get a divorce pursuant to Domestic Law 170(7) Irretrievable Breakdown of the Marriage, often referred to as No Fault

Prior to the passage of no fault divorce in New York (2010), parties would often use constructive abandonment. The advice you received is outdated. You now do not need any reason to get a no fault divorce. Instead, you merely state in the court papers that there as been an irretrievable breakdown in the marriage for 6 months or more. You don't need a reason for the irretrievable breakdown.