I think Im really going to try and stop idealizing our relationship and try and focus on the negative things that have happened. Try to view her in a different light.
When I do this, it helps me detach, kind of remove emotion from the situation. It might be good for you to step back a bit from the situation before you talk with her.
I have NO idea how healthy this is, but whenever I feel like I am getting close to H, I will picture negative things, try to remember the things he has done/said to me. Like I said, I have no idea if I should be doing this, but I do.