My boyfriend asked me to kill him, should I get him committed?

I'll preface this by saying that he's depressed, he has always been and I always knew.
Another thing is that he knows I stabbed my ex. I'm not proud of it, nobody deserves that and I paid the consequences of my crime.

Today my current boyfriend had a depressive episode and started talking again about death. He then asked me to do him what I did to my ex. I was horrified and I told him like many times that I'm never doing that to a human being ever again, especially someone I love like him.
He then just murmured 'but killing people is what you do best'.
I walked out on him. I've never killed anyone, the ex survived.

This whole thing gave me a panic attack, now I'm better but I'm very worried. Should I get him committed or a forced treatment?
He hasn't expressed any outright intention but him insistently asking me that like he thought he could provoke me into it scared me.
Updates
+1 y
He still doesn't talk, just goes on making his collages and painting. He didn't even come to bed with me.
Updates
+1 y
He still won't say anything and barely eats, I'm getting really worried now
My boyfriend asked me to kill him, should I get him committed?
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