Hello

Sorry to hear you are having such a hard time. It seems like you feel that you have worked on yourself and are perhaps frustrated than your partner doesn't seem willing to do the same as an individual or to do some more mutual joined counselling.
I wondered what makes you suspect a personality disorder and whether this is something you have discussed with your partner at all? From what you have said (which I understand likely is condensed and not the whole story) it feels like relationship counselling may be a good idea regardless as there seem to be some unhelpful dynamics between the two of you.
Hope you can get some things resolved soon.