Being the most emphatic sign is awesome. As Cancer natives, we are some of the most giving partners, friends and family members there are. Being so in-tune with other people's emotions is what makes us so amazing; the only problem is that it also makes us pick up on their emotional energy as well.
If you happen to be with a grumpy friend, you will very easily feel grumpy as well. If you partner is feeling blue, there you go feeling blue as well. How can you protect yourself from this?
One way to fight it is protecting your energy field. When you notice someone is affecting your mood, imagine a protective shield around yourself, close your eyes and reject the negative energy you are absorbing. With time, you will learn to push it away while still being able to be there for the people you love.