Model Question

Hi, I’m having some trouble with my model. This morning I was just forming the thought that my husband is not taking his weight loss seriously when he interrupted my thought by saying how excited he is with losing weight. I then tried shifting my thought to, “just let him have his own weight loss journey and support him”. I immediately had the thought he won’t succeed or fully commit anyways so how can I believe in him to lose weight/ support him. At times I listen to him about what he’s doing well or has planned but don’t feel like I genuinely believe in what he’s saying, I guess I’m kind of waiting for the next time he “messes up”. I’m not sure where to start in a model so I can change my thoughts about him.