So I married an axe murderer

Charlie, a man who has a problem with commitment, invents excuses to break up with his girlfriends--one's a kleptomaniac, another must belong to the mob--and works them into his poems which he recites at a San Francisco coffeehouse. But then Charlie meets Harriet, a butcher at Meats of the World who may be his soulmate. There's a little problem, though, since Charlie is convinced Harriet is the unknown Mrs. X, a tabloid favorite who marries and murders her husbands.