I didn't mean to generalize anyone, or offend anyone by using the word bipolar. I can understand the noun adjective. Sorry.

This isn't just a girl I dated. We were high school sweethearts. My family moved my junior year to another state. She gave me back my ring (yes, we were engaged) and broke up with me before we moved.
A few months ago, she got a tattoo with our initials in it.
She said it was to solidify her belief that we should be together. It scared me at first, because we haven't been real serious since she moved out. And in a weird way, it made me feel special.
I had given a lot of thought about her. In some ways I saw her making progress with her emotions. I was married to a woman with BPD, but she would never seek help. The fact that this girl was actually trying by going to therapy and taking her meds made me feel proud of her.

Maybe what I'm looking for is someone to tell me it's the disorder, and not her that caused her to find someone new.
What really stinks is I can't get any resolution from her. Her new guy answered her phone a few days ago. He told me he now has her phone, and she has his; that way she can avoid talking to me.