You both have some challenges together, as you both have very different values. Cancer needs a lot of emotional safety to trust in relationships, whilst Sagittarius likes to feel free to relate to many and different environments. Sagittarius loves adventure and change which may cause a lot of insecurity for Cancer, whilst Cancer likes to express a depth of feeling and care that Sagittarius may find claustrophobic and inhibiting. Cancer can learn to be more courageous and extroverted from Sagittarius, and Sagittarius can learn to be more comfortable with deeper feelings and vulnerability. If Sagittarius has lots of movement and Cancer can develop some form of inner safety, then this relationship can go well.