Should we break up?

Okay so long story short we've been on and off 8yrs I've tried breaking up recently but it only lasts about a day before I crawl back. It's fine for the first little while but then I go back to being annoyed and just wanting space and to do my own thing. The big issue is they're suffering with personality disorder which means sometimes they're the person I remember them as and other times it's like I'm talking or trying to connect to a stranger. I'm also always the one doing the talking I know they're going thru a lot so I keep trying to hold out but at the same time they have no plan for their future anymore and anytime I try to encourage them to find things they love they just shut down. In turn it's make me feel lazy and all my goals I have worked hard for over the past few years have been getting pushed to the side as well as my self care to try and help my partner. They want to be around me all the time which I used to love but they get super hurt and shut me out when I ask for space to take the time to look after myself. I just don't know what to do as I keep being weak every time we breakup and miss them so much but on the other hand when I was single for a couple months last year focusing on me and my career I seemed to be glowing. Idk if I'm just linking them to me feeling drained because we're in a rut and there going through things or if it's because I truly was better single. Thoughts?