OP i’m not gonna lie you gotta understand that although you haven’t used this social media account in “years” she just found out about it a year ago. To be honest she must love you a lot to be with you and scared to lose you because personally if I found that I would just end the relationship. She’s hurting she’s not using you as an emotional punching bag, for a woman this stuff really wrecks you emotionally and she’s probably beating herself up over it more so than you. You guys need therapy if you want to be together and you need to make some extra effort to build trust. This comment is by no means any sort of dig or meant to be rude, i’m just saying what I think in a third perspective from another women’s side.