Sister-in-law spread the marital bed, for an evening I was luo, open spring mattress, the day his wife back to the bride's family

My name is wang gang, I grew up in the countryside, parents are doing business, business busy at ordinary times, they often not at home, I can do. I have a brother, brother is three years older than me, he is a mature and responsible man, and I completely different, because parents are busy, eldest brother was the one with me, for me, the eldest brother is my brother, not only is more like my father. Eldest brother got married in the second year of work, sister-in-law is his college classmate, she is a woman of wen wan, speak WenSheng fine gas, I'm very good feeling, she could see, the eldest brother is love sister-in-law, two of them like a fairy handsome couple, let me envy. The eldest brother offered businesses want to go to town, I insist to go with him, didn't think in the way, the eldest brother had an accident, killed by a car. Eldest brother died after I very guilty, originally in pool of blood should be me, eldest brother was hit by a car to save me, sister-in-law know this after the event has been with me, she felt that if not me, don't die. I and sister-in-law explained many times, but the sister-in-law after eldest brother died loses the reason, the heart all the resentment out on me, I understand her idea, eldest brother died, I also feel very sad, my sister-in-law and eldest brother so conjugal love, now is the difference between nature and man, I usually try to self-surrender sister-in-law, this is I owe eldest brother. Twinkling of an eye three years later, our family gradually out of the eldest brother died of wounds, I had a girlfriend, we are dating, dating for a period of time, we will get married married, the wedding day, has refused to talk to my sister-in-law also went to the wedding, sister-in-law also take the initiative to help us spread the marital bed, I'm flattered. At night my wife and I go to bed, I a turn, feel the sheets under something to me, I don't have to wake up his wife, secretly open spring mattresses, found hidden beneath a straw man, it also with the bamboo stick, written dog behind a string of words, turned out to be the wife of a birth horoscope. Watching curse of the little people, my heart is cold, it must be sister-in-law put, she and I also hate the vicious to curse his wife, I am afraid sister-in-law again hurts his wife, hurried to wake up his wife, took her back to her home overnight. Now I'm at a loss, I don't know what to do about my sister-in-law, to say is I owe the eldest brother, my sister-in-law is elder brother's wife, I should have a good to her, but I cannot allow sister-in-law hurt my family, you say what should I do?