<human>: Can you give me the gist of the text in a nutshell?

My partner and I have been together for over 18 months now. We met after both going through rough break ups and clicked immediately. She fell pregnant quickly (3 months in to our relationship) and  our daughter is  the  most important part of my life. 

When we were first started out she told me that she had Borderline Personality Disorder. I thought I could handle it but the constant turmoil and arguments it causes is driving me to the brink. She refuses to seek treatment for it other than to take medication for her anxiety 

I've come to the conclusion that I need to finish it with her as I don't want to bring our daughter up in a poisonous relationship. However I'm really worried, due to how manipulative she is, that she'll use our daughter as a weapon against me. 

I'm looking for advice as to how I can end this relationship without her going off in to the deep end of the crazy pool and trying to ruin my relationship with my daughter
<bot>: Need to break up with manipulative BPD girlfriend but am scared shitless Ithat she'll use our daughter as weapon to get back at me.