Hi and thank you for your question! It is a terrific one, and one I get often.
Weight is complex and often involves stressors, environment, behaviors, genetics, culture, pleasure centers and more. The relationship people have with food is also very complicated, so the "path" that results in Obesity and Obesity related disease states is not the same for everyone, so getting off medication does not look the same for everyone.
Currently, regarding Tirzepetide (Mounjaro or ZepBound), there are ongoing studies to see what "maintenance" or getting off the meds looks like, but from my own personal experience, weight gain after stopping treatment depends on a number of factors and does not occur with everyone. In myown practice, part of the membership is to try and break old habits while creating new ones, and figuring out the role people have with food and beverage and redefining that is paramount to preventing weight regain- but I do not like to pathologize things that may be normal.
It is NORMAL to be afraid of weight regain after losing. It is NORMAL for some fluctuations to happen, but keeping in close communication with your physician about your fears, goals, dreams and having an understanding physician supporting you during this journey is key to achieving success. I wish you well! Weight loss is a transformative JOURNEY for a reason.