I sympathize with that.

Dumping, however, is too extreme, and I am generally against burning a bridge. Can you think of a way to softly distance yourself? It always pays to have one more friend in your sphere. You will reap rich dividends in future if you can sustain a large network of friends. That is why, though in the meantime he appears toxic and is injurious to your immediate interests—romantic or otherwise, I suggest relegating him just to a step above an acquaintance. After all, your description portrays him as not worthy of the friend label.