Scorpios tend to keep their deepest, most private emotions and ideas to themselves because they are so terrified of being betrayed.
Scorpio keeps everything inside as a form of personal defense and safety. It takes Scorpio a long time to open up and be truly vulnerable since they are afraid of investing their trust in the incorrect person.
Being vulnerable in relationships is tremendously difficult for Capricorn because of their emotional repression and extremely practical methods.
Capricorn prefers to tackle everything on their own since they don't want to be a burden or seem weak.
Being vulnerable is the one thing Aquarius despises more than being conventional. The heart of an Aquarius is kept in a lockbox that only they have the keys to unlock; they do not wear it on their sleeve.
The sign of Aquarius loves to be remote and aloof. This air sign strongly discourages feeling (or expressing) their emotions.