Answer:
Projection
Step-by-step explanation:
Projection is the act of defending one's ego against impulses or qualities, which are conscious. This is done by denying that the impulses exist or blaming the impulse on someone else.
Here, Jerry has the impulse to spend more but does not admit to this impulse. He defends his ego by blaming it on his girlfriend. Basically, he shifted the blame to his girlfriend.