I would love to walk away from everything and walk away from this thread and go off and live my life
Yes, well that isn't going to happen is it. You made a choice to have an affair with a MM and now you are facing the consequences. That is called 'being and adul't and 'taking responsibility'.
However, this has taken over and is ruling my head 24/7 I certainly cant 'sleep at night' now ive told her. I did not get any good feelings from telling her.
You are not supposed to get good feelings from telling her. Telling was for her benefit. To give her the information and let her decide what she wants to do with it. Nothing to do with you.
My feelings of guilt are washing over me constantly and it physically hurts
Good. That shows that you are having a normal reaction. This will last for some time. Accept it.
I am mourning for the loss of a man who didnt exist and I am torturing myself about what was the right thing to do. I keep returning to this thread because it is helping knowing that some people understand to a degree how I feel.
What was the right thing to do? This man had already left you before you told him wife so whether you told or not you would still be mourning over him. Again, perfectly normal reaction to the end of a relationship. You are not different to thousands of other people going through a break up.
All I want is for this mess to be cleared up as best possible. I have done some terrible things and I have lashed out when I was angry, I want to feel OK again but its like I feel guilty attempting to feel OK when I know that she has had the bottom ripped out of her world. Why should I ever smile again?
What mess? There is no mess. His relationship with his wife is nothing to do with you. You are starting to sound like you don't like the fact that attention is not on you any more. Get over yourself, you don't mean anything to either of them.
I need to know how to get out of this cycle
What cycle? You are not in a cycle.
What is done is done, I cant change that, but I cant just 'move on' my head is full of what has happened and my brain is re-processing everything over and over and over
This is called 'wallowing in self pity'. If you keep doing it you will be miserable. It's up to you.
He filled my thoughts when we were together and now those thoughts have been replaced by what I have done and what they are going through now
All normal. Move along, nothing to see here.
My mind keeps imagining what would have been happening now if I hadn't told and wondering whether that was the best option
The same thing would have happened. He would have left you. You would be feeling miserable.
Whatever anyone says I DO care about how she is feeling, I know she will be going through hell. Whilst I know I have to move on, I don't know how to do that without stopping caring what happens to her, if that makes sense. That feels so cold.
This is why posters are so angry with you. You are lying. You did not care one ounce for her when you were with him. You only feel sorry for yourself because of the guilt you feel now.
I dont know what should happen next. I need a plan but I have no idea where to start.
Leave this thread. Start a new one with a different name. Just say you have split with your boyfriend and lots of people will give you good advise and support. Do not mention MM or his wife.
Their relationship is for them to sort out. You just need to get over him. I am not convinced that you want to though. I think you like the drama and attention this thread is providing.
HTH