I made a verbal agreement with a friend for him to buy some household products from me. He took the products and then, 20 days later after using some of them, decided he didn't want to pay me (he was supposed to pay within 30 days). I found out that his new girlfriend wants to get something different for his place. He is now claiming that since it is a verbal agreement and nothing is in writing, he can do whatever he wants. Is this true? I can't imagine it is. Either way, he can go to hell and I just want to know if I can sue him in court if he won't pay me back.