Grounds for nullity are issues that were present before and on the day wedding vows were exchanged. What happened after the vows were exchanged are not grounds although in some situations it can be used as evidence to what was happening when the vows were exchanged.
Emotional abuse during a marriage are not generally grounds for annulment. A tribunal is looking to see if a marriage was valid or invalid. If it was a valid marriage when the vows were exchanged, nothing that happens after can make it invalid.