Final answer:
Dopamine is the neurotransmitter that creates motivation and cravings to be with a particular partner.
Step-by-step explanation:
The neurotransmitter that creates motivation and cravings to be with a particular partner is dopamine. Dopamine is associated with feelings of pleasure, addiction, movement, and motivation. It is released in the brain when we engage in activities that we find rewarding, such as being with a partner we are attracted to.