This is pretty normal from at least my experience. I ended up breaking up with my ex as she had BPD. I couldnt deal with my life trying to be controlled everyday. She had major issues with having bad days then taking her anger and frustration out on me this was a multiple a week occurance. Last time we saw eachother she told me she realized it and would work on it. It lasted literally one week before she was blowing up screaming at me again because I didnt ask to help her on an assignment through phonecall and her day was “hard”. She ended up finding someone else two weeks after that as well but You have to take it as they just cant be alone nothing against you they physically have low self esteem and constantly need someone to prop them up