How often did you interact with her H? Did you ever talk to him before?
Sorry if I missed it, but how long have you two been going out?
It would seem that if she started calling you her H in front of people, then she's got some issues. That should have been a huge red flag. Honestly, how do you know that she hasn't been having regular sex with her H? Not to be too direct or anything, but he is her H.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.