Crabs need to feel this for a soul mate union to happen...A homebody at heart, Cancer needs to feel completely comfortable before moving forward in romance.
All the qualities may be there - emotions, compatibility, shared goals and more - but if you can't relax and be yourself, it's all for nothing.
You know when it's right, and when it's not quite working out. Being true to yourself and valuing what your intuition is telling you ensures that the relationship you end up with is the perfect, safe place for you to be.
Trust that your instincts are right when it comes to matters of the heart.