I have a friend at the office, who is very dear to me. I don't have many friends, and I've known this person for over five years. But recently they've become increasingly cynical and sometimes outright toxic. Saying things like "our job doesn't matter", "nobody cares", and "you should stop trying to improve things". The company we work for had incompetent managers for the last couple of years, who were ignoring issues and basically making it up as they go. The management was basically purged, and now there are a lot of new people. So I guess it is my friend's way to cope with the situation. But it feels unhealthy, because recently they started lashing out on people, including new people who have done nothing wrong yet.

I am honestly kind of afraid to bring this issue up to them, because (a) I am afraid to lose them and (b) they will probably respond with something along the lines of "you don't know what I've been through", or "eff off", or plain old silence. I feel like they are hurting, but I don't know how to help.

What should I do? Should I do anything at all?