My bf had a motorcycle accident 6 months ago which injured him to the point of impotency. How do I dump him gently so he won t kill himself?

Update: I am not dumping him because he's impotent, oh no. But he's totally changed since the accident. Always depressed... I tried my best but I can't spend the rest of my life with someone like that. I mentioned his impotency to let you know why he may kill himself.
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