You don't heal from a burn by continuing to touch hot things. You don't heal from a cut by ripping open the scab twice a day. And you don't heal from the effects of what appear to be a seriously toxic family by staying in touch with those people.

It sucks that LW doesn't have a mother to talk to anymore, but there's probably a good reason for that. And it sucks that LW's brother is so unpleasant, and he probably wouldn't want to be like this if he had a choice either, but LW can't heal him, and LW shouldn't hurt herself to try either.