During sex, my wife shares her premarital sex experiences when she is aroused. During sex, I also enjoy those things. However, after sex those things hurt me a lot.

Erotic talks during sex are normal, in fact desirable to increase sexual pleasure. Talking about your own sexual experiences with someone else may give you pleasure during the act but later on it may be traumatic and damaging self-respect of both partners. You should decide to stop talking about your personal past experiences and may continue talking about non-personal erotic imagination or fantasies.