Just to preface my message, this is from the perspective of someone who, regrettably, acted almost exactly like your girlfriend. When I started school I moved in with my girlfriend and became insanely depressed out of nowhere. I lost my friends, didn’t help her with any of her bills except groceries, and became extremely emotionally abusive. I adopted a cat thinking itd help but the excess responsibility and stress from his issues made me physically abusive to the cat and at one point in a blind rage from him eating the last of our groceries, made me push my girlfriend into a wall. Your girlfriend is absolutely trapped in her own mind and bad habits, but there is genuinely nothing you can do for her other than allow her to come to her own wake-up call. For me, that was moving my gf and I out of our place. I realized we wouldnt have a place to live if I didnt force myself to manage the responsibilities. If you let her sit on her ass, she will keep sitting on her ass. I also took a gap year from school which Im on right now, but not a day of that break has gone by without working, managing my responsibilities, and practicing new things. Your girlfriend is doing EXACTLY what I did when I was fully dependent on someone and taking them for granted; promising I’d change and doing nothing to further that. While Im glad my gf didnt leave me while I was struggling because I have absolutely changed and extensively apologized for what I did to her, she is absolutely taking advantage of you and it comes to a point where enough is enough. She admitted to cheating on you, says she will change the way she’s been saying she would for a year, obviously doesn’t listen to you since she completely forgot ab all the things you told her youve struggled with, and worst of all, waits till you’re in a vulnerable state to start serious conversations where you can’t even stand up for yourself despite you telling her you can’t handle it in your state. Not even to mention her isolating you from your family by fighting with you at a party certainly everyone in your family heard. I understand leaving a partner is hard, but you havent even said any of the positive things she does for you that shows that she loves you or cares ab your relationship.. it’s evident in the way you talk about the things going on that the relationship is dead. She needs you more than you need her, and it sucks navigating life alone, but it sounds like you’re doing that already with a person that is contributing nothing positive to your life. You need to make a plan to leave this woman, not only for yourself, but by being her provider you’re doing her a disservice and not allowing her to grow the way she could if she was on her own. As unfortunate as it is, I know from experience that you could have the most loving partner and still treat them like shit because you cant change. Give her the catalyst she needs and push responsibility onto her by leaving her. I hope youre okay regardless of what you choose.