Did I do something wrong?

I have to have a meeting with my HR department tomorrow morning. they found out that me and one of my managers are a couple. we started dating before she became my boss. they originally offered me the position but I told them she was better for the job. at first we tried to hide her relationship but after a while people started to notice. we have a rule that manager are not allowed to date employees under them. I believe my personal life shouldn't affect my work life. but someone told HR on me and my girlfriend and now I have to head to a meeting with HR. I may either lose my job, get suspended or may have to transfer to a different store. Even though we started dating before she became my boss did we do anything wrong?
Did I do something wrong?
Post Opinion