I want to cut my friend off because of their mental health issues.
Why is that the reason you want to cut them off?
He's too depressed all the time, and it's bringing me down.
I get that your friend's mental health issues bother you, but a good friend would not let that be a reason to cut them off. You should support your friend so that they can get better.
I'm going to ignore you and look at pictures of Kim Kardashian.
It can be really hurtful to cut people off if we are friends with them. If he is getting more depressed you should try to talk with him about seeing a therapist it might be good for them.