All of the property issues need to be resolved in the divorce. A verbal agreement that he is apparently now saying was not fair, will probably not be enforced by a Court.
Divorce is an emotional process as well as a legal one. Statements that divorcing spouses make at the beginning of a divorce often change as a case moves forward. The time of separation is an emotional one; people often are not thinking clearly.
You might consider mediating the questions related to the property division.
