It seems to me that you know what needs to be done, you're just too emotional, possibly even scared/tired that you're having to go through this again.
Yet you must do what must be done.
Two marriages and similar problems each time, I don't want to point fingers at you as being the common denominator but is it something you're doing specifically to turn these men off or is it just bad luck on your part for picking two lemons, one after another.