Depression Support Group
Depression is a real and debilitating condition that is often misunderstood by family and friends. Its meaning can range from a prolonged period of sadness to an actual mental illness with specific symptoms. Find and share experiences with others who are going through the same struggles.

That's the only advice I can give. Hopefully one of then will hear you out. People don't understand unless they've been there themselves.
You know what is fun and calming...
Integrating healthy, wise, sane, guiding voices into our lives, like him....
https://m.youtube.com/watch?v=wa5IF7x-ziA
If he's badmouthing you, and your other friends are really good friends then they should tell him to shut up they're not interested in his bashing and gossip.
Your other friends have a brain, they have conscious thought, they can think about their feelings for you on their own. How they feel about you is how they feel, just because he's running his mouth wouldn't cause them to not like you anymore.
You need to have a talk with your friends, and you need to ignore Bob the idiot.