Agree with In It that you may still be in shock. A year is nothing in our healing, and sometimes people get stuck. It took me 8 months, two extended trips out of state, a lot of drinking, the death of my mother and 70 hours as an "inmate" in a psyc ward to move past shock.
The images are hard to deal with although, like Anjae, is was more the lies and deceit that messed me up. Once I finally accepted that he isn't worth what I was doing to myself, I was able to start letting go of everything. I had a lot of strategies including taking those images and morphing them into something I found funny--my favorite being thinking about them having sex him farting on her face. Gross, I know, but for whatever reason it made me laugh. I also imagined her growing copious amounts of hair from her nose.
Also, many of them use sex as a bandaid to forget whatever is actually bothering them. I told mine exactly that at BD and he got mad at me (surprise!). As In It said, it's about how they feel. Everything is about them. Everything.
You asked, Barbie, how we get rid of the pain. We don't. It tempers with time, but what they've done to us will always be there. Forgiveness is a conscious decision, but that does not mean we forget. I know I cannot forget the truly reprehensible things that were done to me, but because I understand the man is in MLC, I have a decent understanding of why he has done what he's done, and that helped me with forgiveness. More important, though, is that I needed to forgive him for myself. I learned to ask myself one important question: how is hauling around all this garbage serving me? When I found my answer, I let whatever it was go. The truth is, I initially didn't know how to let go. We hear that we've got to do it, but there is no instruction manual as to the process. For me it was asking him to leave and realizing that I am married to a stranger whom I do not like most of the time.
There was one other thing that I learned: turning my thinking. I am not very adept at looking at various experiences from a variety of perspectives. I have my initial gut reaction but just think about what else might be going on. Learning that skill helped me to realize two things: I don't have a clue what's happening in his head and it doesn't matter. What matters is how I choose to live my life now. I choose not to fixate on what he did. Again, all of these things happened and are facts of my life. I cannot change them, but I can accept them for what they are...part of the tragedy of MLC that became my crisis until I chose not to make it so.