What should I do if my partner remains moody after discussing his doubts about infidelity (which aren’t true)?
I would give him some time and space to process his feelings. Ask him what you can do to make him feel comfortable. Hopefully, this is a one time thing.
If your partner makes ongoing accusations of infidelity with no basis in truth, he may have some underlying trauma or attachment issues. In this case, he would benefit from working with a mental health professional.
Please keep in mind that repeatedly accusing someone of being unfaithful with no evidence of such can be a form of psychological abuse. Please seek assistance from resources like the Domestic Violence Hotline if you feel unsafe in your relationship.