Cooper recently moved from his family home to take a new job 2,000 miles away. Excited to settle down and start his own life, Cooper is interested in finding that special someone, a partner to build a life alongside him. However, after repeated failures to find someone he is really interested in, Cooper decides to give up on finding a partner and buys an elaborate gaming system to keep himself occupied. Erikson would suggest Cooper is experiencing difficulties in the stage of __________.