This combination of water with fire highlights the great differences in your natures. Without good communication you could feel that you live in different worlds because Sagittarius is far too wayward and freedom-loving to be domesticated and home orientated like Cancer. Sagittarius is mentally, emotionally and physically independent, which can make Cancer feel insecure. Both are generous, in different ways. Cancer is inclined to cling. which can cause Sagittarius to feel smothered or trapped.