I think you need therapy and im not saying that lightly. You are not staying because you love her, because shr makes you happy or because you two are good together. The only reason you are still there is because you fear change, fear being alone and are obviously quite insecure because you dont realize you can do better. So what if she moves on, meets someone new and gets married? So will you and hopefully, with therapy you will change your own level of self worth and face and conquer your fears so you never end up in such a dysfjnctional, miserable relationship again. You need to walk now and dont look back, you know its for the best and great things are out there waitjng for you once you grab life by the balls and face all your fears. You need to be strong now and just do it and never start a new relationship based on lonelieness, insecurity or fear. You need to find happieness first alone and then you will be ready to meet someone new and wonderful. Remember when you finally pull the plug, you have to mean every word and you have to make it clear to her. There is NO turning back once you do it. Stay strong and good luck x
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