I'll try to provide context without giving away too many personal details. Apologies in advance for the insane typos in the screenshots, please try your best.
They asked me if this was all took much/too hard for me (they are currently trying to get sober/ detoxing after relapsing, something they never mentioned to me when we met/got into a relationship). I do not want to be in this relationship anymore. Let me make that clear, however I have stayed out of genuine concern that they were going to harm themselves, countless failed attempts to leave (being held emotionally hostage) and fear of what they would do when we actually separate. I tried to avoid the question saying it wasn't as simple yes/no answer for me. They took that as rejection and told me I should leave. They were acting calm, level-headed and civil, so I took the opportunity to get away from them. As I was gathering my things to leave they begin to interagate/berate me "you've just ruined my entire life" "so you've just been lying to me this whole time?". I didn't let myself get pulled into it (for once) and just left. The texts occur as I was going back home to them showing up at my house and frantically ringing my door bell/knocking. Bonus photo at the end is them impersonating their (likely imaginary) therapist.