While past conduct may not be of much utility in determining spousal support, spousal support orders can be varied when there is a material change in the circumstances of either party. (familylawhelp.ca)
Most types of alimony awards may be modified or terminated if there has been a substantial change in circumstances since the final judgment was originally ordered. (familydiplomacy.com)
A court may modify support where there is a substantial change in the circumstances of the parties or needs of the children. (illinoislegalaid.org)