The hard part is, that because of her (potential) unstable mental and emotional state, he is very fearful to provoke her in any way and is therefore still not willing to cut things off. Is still hoping she will... What do I do with that?
Help...?
B-O-U-N-D-A-R-Y
her feelings and actions are not his or yours responsiblity. Point out that is the co-dependecy talking. Show him what healthy relationships look like be setting and enforcing a boundary. he will thank you later.
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.