You don't owe anyone years of your life at the cost of your mental and emotional health. Don't let anyone guilt-trip you for not waiting around while they fix their problematic behavior. Some people will drain you completely and still expect more like it's your responsibility. You are not their life coach, therapist, or personal guide to basic adulthood. If you can learn things on your own, so can they, it's not a group project. Don't stick around trying to train someone in things they should already understand. Because they won't learn, they'll just blame you for everything that's wrong. So do yourself a favor and leave, without guilt and with a little bit of pride. Make sure they see you choosing yourself for once instead of choosing them. And if they're still confused, well... they lacked basic sense anyway, so expecting them to realize they just lost their last chance at being a decent human being was a bit too optimistic.