['Hi friend. I feel very ashamed because I got cheated on. I feel very negative and just depleted of emotion. I trusted them.']
Well, that't not your fault at all. It's your scumbag significant other's fault. You shouldn't feel ashamed for the crummy thing he did - you did nothing wrong.
I was very ashamed when I found out I got cheated on. It really just took all the energy and hope out of me.