Leave it to an Aquarius to be more logical than emotional. They'll still cry and show affection but in terms of everyday life, they'll rationalize more than anything. They prefer a life where emotions don't get in the way.
A/N: Probably because emotions confuse them (sometimes). It's not something they can prepare for or expect. They prefer to deal with things in a more controlled manner and with emotions, it can be unexpected and mess with their brain and thinking process.