Since you paid for it, it's option a), stop feeling bad for it cuz it's not your fault
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And based on your update if an ex did that to me... I wouldn't feel anyways... I would only laugh at the time frame that it took them to disable it. Because why let me ride their Netflix account that they are paying for... id feel they were still hung up on me..
She wouldn't have to provide my Netflix. Is leave it open for her
Definitely change password