It happened to me before when I was younger. Not only with the current partner, but also with friendships I had or even activities I used to enjoy but just that suddenly, I didn't like it anymore. 

I feel like my current relationship is more like a moral commitment than something I actually want to be part of. I've always had issues telling if my interest on something/someone was really over or if my BPD swinging moods was the one responsible for it and I actually still enjoyed being with that person or doing that thing. How do I recognize which is the case here? Next therapy session is in two weeks, but I feel like I need to make a decision, I don't feel comfortable anymore but I don't want to decide something impulsive I might regret later.

Any sort of questions I can make to myself to have a clue about it or any tip would be appreciated.