It's possible that your narcissistic boyfriend is engaging in such manipulative behaviors, like planting things for you to find and get jealous, for a variety of reasons related to his need for attention, control, and validation. Here are some potential reasons behind his actions:
Attention-Seeking: Narcissists crave attention and validation from others. By creating scenarios that make you jealous, he might be seeking your emotional reactions and reassurances of your feelings for him. Your jealousy may temporarily boost his ego and make him feel desired.
Control and Power: Narcissists often seek to control their partners emotionally and psychologically. By making you jealous, he gains power over your emotions and may feel a sense of control over your reactions.
Manipulation: Creating jealousy is a manipulative tactic used by narcissists to keep their partners off balance and more emotionally invested in the relationship. When you feel jealous, it may lead you to work harder to please him or to seek validation from him, further reinforcing his control over you.
Lack of Empathy: Narcissists struggle with empathy and may not fully comprehend the emotional impact of their actions on others. He might not recognize or care about the distress or hurt his behavior causes you.
Insecurity and Low Self-Esteem: Behind the grandiose exterior, many narcissists harbor deep feelings of insecurity and low self-esteem. Creating jealousy may be a way for him to validate himself and reassure himself of his desirability.
Regarding your question about having no other supply, it's possible that the current dynamics in your relationship contribute to his behavior. If he feels like he is not getting enough attention or admiration from you, he may resort to creating jealousy to elicit a stronger emotional response from you.
It's essential to recognize these manipulative behaviors for what they are and to set boundaries that protect your emotional well-being. Healthy relationships are built on trust, mutual respect, and genuine care for one another. If you find yourself consistently dealing with manipulative behavior and emotional turmoil in your relationship, consider seeking support from friends, family, or a therapist who can help you navigate these difficult dynamics and make decisions that prioritize your happiness and well-being.