The difficulty comes when this is a life-pattern, established as a child before the OP was equipped to moderate the ups and downs of relationships. It won't ge

The difficulty comes when this is a life-pattern, established as a child before the OP was equipped to moderate the ups and downs of relationships. It won't get better. That is appearing to be the concern of the OP. IMO the OP needs to be supported and nurtured during this transition. So, finding self-care anywhere they can is the advice I'd say. And for the long-term, advice from a therapist can help train their child-mind to better handle this dynamic life.