My 10 cents......if you don't snoop, if you don't ask R questions, if you don't initiate conversation, if you don't respond to text messages that are not a question, if you stop trying to mind read, if you don't tell her what your doing or where you are going, if you stop asking who, what, where, when, why questions you will start to detach. Time, space and distance.
IMO the actions you take will help with detaching but those actions don't mean your detached. Being detached is a state of mind.
I am 8 months in and am still probably not 100% detached.