Betrayed by husband and mother

I need help trying to get over betrayal from my husband and my mother. Last year, I found out that 9 years ago my mother discussed her sex life and lack of it to my husband and he then discussed ours to her saying it was never enough but it was quite often and then told her he could take her away and make her feel good then hugged her and touched her butt. They said nothing happened after that was said but they kept it from me and did act flirty towards one another. It always seemed like there was something going on but I would put it out of my mind because I trusted them both so much and never thought that they could hurt me like they did. Looking back, it seemed like neither one was remorseful since I didn't know what had happened. I don't know how to let go of the hate I have for both of them and don't know how to trust them again. Please give me some guidance.

Honesty if I found out my mother nd boyfriend was acting like that I would hate them both too . If he can act like that with your mother than he can do it with anybody body . I would just try to breakup with him . I know it will be hard but thats what I would do . I hope this helps .