Moving on

How am I supposed to get past this? I have so much anger, it is eating me inside. I am so angry. I am so beyond hurt. I don't know how you trust someone and love someone and share your life with them and then it's just gone. Buck cheated on me with the girlfriend he had before me. After six years together, he did this. After countless, I love yous and we are going to be together, just gone! I have so so much anger, I can barely stand it. I am disappointed, hurt, heartbroken and feel like I can never possibly trust someone again. I mean how could I trust someone again? I now that many many people have been in these shoes and worse, but it just feels like I am drowning in it. Our relationship was not perfect and I have stated on here before that I felt like we were on a slow decline, but to end like this! OMG! I am so angry. How do you do that to someone? How could he even stand there and look me and lie right to my face!? And what about Luke now? That was his Dad? Not biologically, but since he was 5 months old. That is not the example I want for my son to lie and cheat on people, but how do I just take that away from him? And how am I supposed to move on and heal with so much anger? I got the dog thinking that would help. I can't really say that it has. I feel just completely betrayed and so depressed. I don't know how to get past this. It hurts.....alot. It hurts more than I want people to know. I don't know how to be the same again. I don't think I could ever trust anyone again, I mean really trust someone. How do you get past this?