He need to talk about it to a therapist. Maybe it would be easier to talk if you weren't there.
And it's important for you to know that "his issues" are just that HIS ISSUES, they are not your issues, you shouldn't let what he is doing impact your self esteem (yes I know easy for me to say hard for you to do).
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“If we could change ourselves, the tendencies in the world would also change. As a man changes his own nature, so does the attitude of the world change towards him. ... We need not wait to see what others do.” Gandhi
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