"Compulsive spending" is when someone feels an uncontrollable urge to constantly buy things, even if they don't need them or can't afford them. It's like having an addiction to shopping and spending money. Full definition
If you have trouble with compulsive spending, it's best to take away the tool that makes it so easy to get into trouble. (business.time.com)
A common cause of compulsive spending is deprivation during childhood. (moneysense.ca)
Negative repercussions resulting from compulsive spending include financial difficulties that may amount to overwhelming debt, personal distress, and social and relationship conflict. (goodtherapy.org)