live in realtionships better than committed one?

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i have one girl friend,she was discussing with me other day about her live in realtionships.she is having many live in relationships without any problems and committments,she enjoys her life in her own way. she is reluctant to have committment to anybody.so i am also tempted to have live in relationships rather than committed one,i have many girl friends they may agree for that.but dont know how to approach.can you throw some lights on this?