Your guess is probably right that she contact OM. But, you can't think, every time you assume that she did something wrong, that she is going to leave.
She agreed to no contact. Did she also agree to some sort of transparency plan to reassure you that she is not contacting him? If she agreed to no contact, there is no reason not to ask for that. Until she stops getting her "fix", her feelings and thoughts are fogged. You will continually get mad at her.
