A new supply is the latest person a narcissist latches onto. This could be a new partner, friend, coworker, etc. Narcissists tend to have a constant source of new supply in their pipeline and move onto their new supply at lightning speed. This can be incredibly painful and confusing for those with whom they were previously involved.
Example of New Supply
Todd met Tina while he was doing an internship overseas. Tina was intelligent, funny, and stunningly beautiful. Their relationship picked up speed fast, and within six months, they were married. Todd showered Tina with gifts and spent tens of thousands of dollars on clothes, plastic surgery, and a car for her. Todd told Tina that he wouldn't continue spending this kind of money, as he wasn't wealthy. His money came from an inheritance that was quickly becoming depleted. Within three weeks, Tina left, taking everything with her and draining what was left in the account. Todd was devastated, but he was even more devastated when he saw Tina's pictures online with another man.