R’ Gershon,
What makes you so certain you are incompatible? If you are apseding so much time with her, than maybe she is your basherte, and the yetzer hara is keeping you from realizing this. There have been many instances of similar cases happening, i.e. two people thinking they are just friends, when they really belong together. Maybe if you have such a closeness, you should work on cultivating the relationship.