My Partner Of 8 Years And I Broke Up Just

my partner of 8 years and i broke up just after a 5 day holiday.This was 3 months ago.I knew of his Bipolar from the beginning and loved him to help him in any way i could.But before during and after our holiday he became verbaly aggressive towards me.he .Appolagised then done it again. he text rang and emailed another appolagy .But he wants to discuss how he is not me.My question is how can you know if its his bipolar or he is just being nasty????.he is on his meds and doing his yoga like i was never even there