You have friends out here that really feel for you and care that you are having a tough day. Keep your chin up and let us know how you are doing. We worry when we can't find you on the boards. Your wife may love you but just cannot express or show you. By all means write your letter and let your feeling out. She may not understand what you are trying to communicate to her. Sometimes the written word helps because they can re-read parts that are not clear. Sounds like you want her to understand that you still envision a life with her, so let her read that. Good idea to write this letter to her, she may have to have something tangible like this letter to hold onto hope. It is definately worth a try.
It's hard to have patience after trying for so long, but the situation has changed by your moving out of the house. Give it time and don't make any decisions until you know that you have a clear head. It's hard to do especially when we are in turmoil with our situations, but take your time making those life changing decisions. Give her time to make an effort, too.
Our lives are in sync again. I left a week ago, staying with really terrific, supportive friends. I'm not really grieving but the realization that my marriage might be ending is a sobering thought. I'm willing to try if he will, but just don't know what is in store for us.