Virgo Unless a Virgo really confides in you, they will not talk about a crush. They keep their emotions locked up because they don't want the wrong person to find out.
Scorpio Because they are so pessimistic, Scorpios will wait until they are completely certain that their crush feels the same way before making a move.
Sagittarius Sagittarians are known for their daydreaming. When they have a crush on someone, that person will occupy every spare thought they have.
Aquarius It's possible that Aquarius is making excuses for themselves, telling themselves that they just don't have the time to ask out their crush.