They can't. Nobody's perfect, obviously, but in a healthy relationship both people at least can give the other what they need: emotional support, a reality check, or similar things. If only one person is doing it, the relationship isn't healthy. The only way to sustain such a relationship is for one person to be the enabler -- and that's _not_ healthy.
Which may be the role you've taken on. But I'd need more information to say more. Want to elaborate?
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