How do I tell my boyfriend that people venting to him is not good for his mental health?

My boyfriend is the “vent friend” of his friend group. They’re all a depressed bunch, and every other day, they message him threatening to kill themselves? He feels like he has to fix them or else they’ll end up dead and then it’s his fault. I don't know it just seems toxic to me like they should get professional help!! Every time we go on a date or anything he’s always glued to his phone because he has to solve someone else’s problems. It’s gotten to the point that I catch him crying and in a panic, and he tells me everything is fine and that it’s not my business. I get that they’re his friends, but how do I even talk to him about this?

How do I tell my boyfriend that people venting to him is not good for his mental health?
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