Wife had an affair a year ago she says the other guys penis was too small and she didn't enjoy it should you believe her?

Who cares whether or not she enjoyed it, or what the size was of the other man´s penis. The question is do you want a wife who is faithful? Trustworthy? A good role model for your kids? Sure you should believe her because it is probably the truth. However, what your question tells me is that she is going to continue looking until she finds a guy with a large penis. She obviously has a thing for penis size.