The coffee-cart Girl

This was a ok story about love. A woman has a coffee-cart that she runs a business out of to make money, and she has a couple of regulars that come buy everyday to but items, but one of them sees a ring on her finger and becomes very jealous and puts a knife to her throat and threatens her. She tells him that it is just a method of payment from another customer but he doesn't believe her. The man doesn't threaten her but said he was sorry. He never say her again. That was strange what would poss a man to do that to a girl he hardly knew. I guess many things drive a man nuts...