Infidelity in marriage

I got married to my wife 8 months back and we got got engaged 2 years back. After 6 months into the engagement my wife confessed to me about getting raped by her grandfather when she was 11, I really felt sorry for then and have made her feel really comfortable physically and initially was very sceptical about not doing anything that might trigger that thought for her. 4 months into the marriage I got to know my wife cheated on me during our engagement by having sex with a friend twice and the sexting continued untill recently when I found out. When I asked her the reason for cheating, she told me that she did it because she always wanted to try to do it as she couldn't do it because of the rape incident, she said she had tried to do it with the same person many times in the past but couldn't really end up having sex, but did it during our engagement period. We are still a married couple and i love her a lot, but i really don't know if I should continue our relationship or end it here.