I guess that your relationship with your girlfriend is now past 1-2 years. It happens with most of the people I suppose, the monotony of the things happening around you or because of too many small fights which you people want to avoid but can't. I went through the same problem in my last relationship and I left my ex-girlfriend for 3 months because of the same thing that I was having doubts over the relationship ( also I was the one to propose her and make life long plans with her and she wasn't serious in the first place but with time like your girl she became serious regarding this ). But honestly speaking i regretted that thing, because I realized that when nobody was there at certain times she was the one who was there for me and I also will have problems living without her because I really loved her. I will advise you from my experience that stick to this thing, give your relationship time, indulge in some fun activities (not sexual only) which involves knowing each other better and course yourselves away from the monotonous activities or any other regular thing which you people do. It can be as simple as spending time in a hotel room without having sex or going on a holiday or just playing out some fun games.
Also if you really want to take a break or end this relationship do that with much thinking because your act would have an impact on the girl and seriously Girls never ever forget a thing P and if you will return to her after realizing that you love her and even if she accepts you there might be a chance that you people will have trust issues in future which will only spoil the relationship.
So I would suggest try option 1 instead before going for option 2