Cancers don't flow like water.

They are the most sensitive, demanding, and emotionally draining zodiac sign. 

 Cancers' ruling planet, the moon, causes sudden emotional swings.

They can become temperamental and blame you during Jekyl/Hyde moods

which they have little control over. They go from hurt to fear, anxiety, and anger

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Even with your full attention and support, their emotional instability

Aries will compete with you whether you want to or not.

They are demanding like kids and dogs and require a lot of energy to entertain.