I can't even tell if you guys broke up from this post it's just emotional and everywhere. Kinda seems like you guys need to have an adult conversation about your relationship, why you wanted attention from this other guy, and how to move forward.

Melee, ranged, or magic?

Tell her to mind her own business and not go through your mail and take care of it on your own? Youre 19, everyone gets horny and does stupid shit you have no need to explain yourself as a working adult just because you live with them.