If youre feeling THAT bummed out by the relationship and arent happy why are you stayn in it? If you want things to work out with her why dont you talk to her FIRST! See what it is youre feeling YOUR missing and let her know those things...but approach with a positive attitude dont let her get defensive or it is over...just let her know how much you care about her and this relationship and you feel some things are missing and how or what can you do to bring the "spark" back(not her YOU) if you approach it with your own issues and not hers it wont seem like its all her fault-but evaluate what it is you want first! Then go talk to her...

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everything happens for a reason...