My husband made a pass at my daughter

I am a mother of four, two girls, 20 and 22 and two boys aged three and five. I was a single mother for 11 years until I met a man who expressed interest in me. We dated for a year and I told him I was a mother of two and introduced the girls to him. Although he did not have a child, he took in the girls as his own children.

We eventually got married five years ago. Our marriage was blissful until recently when my first-born confessed to me that my husband, who is 40 years old, entered her room and demanded sex. Although she was so scared, she scared him off saying she would report my husband to me. Indeed she reported my husband late that night. My husband was so embarrassed that he went on his knees and apologised for his behaviour. The next day, I too apologised to my daughter on my husband's behalf and pleaded with her not to tell anyone else. I also cautioned her and my second daughter to watch out.

However, since then, every time I'm having sex with my husband, I remember his attempt on my daughter and get depressed.

I no longer love my husband, because I feel so betrayed and I'm afraid for my daughters.

For many years, I was reluctant to get married again because I did want to suffer any disappointments. My husband's actions were beyond disappointment.  

Even after I got married, there were many other men expressing interest in me, but I rejected them out of respect for my husband. However, the pain of betrayal so much that I'm failing to cope with it. Should I divorce him or stay in this marriage? 

Shamim