Hello
You can’t take responsibility for someone’s depression . I have depression , but I never impose it on others as it is unfair . You are not their carer and it does get draining.

I think that the only thing you can do is offer support but gave boundaries . If they want to talk of the same things , acknowledge and change the subject or say you are busy . V. Hard but has to be done .

I cut out several negative ‘friends’. Don’t miss them one bit , I did everything to help them but they just made me feel bad . They even included me in their negativity ‘we can’t get men etc.’I was always positive to them , but it made no difference, nothing was good enough.