How does being consistent in my emotional reactions build trust with my child? 

Children feel safer when their emotions are consistent. Your child learns that your love is dependable and unaffected by their actions when you respond consistently, even in trying times. They do not need to speculate as to whether they will be greeted with rage or sympathy. Even after blunders, they can approach you easily because of this regularity, which also reduces stress. Perfection is not synonymous with consistency. Being human is still acceptable to you. However, you demonstrate to your child that emotional safety is your first priority when you quickly get over your frustration, provide a heartfelt apology, or respond to misbehaviour with calm firmness. This creates a foundation of relationships throughout time. Your child starts to believe that they can be themselves with you, including their happiness, sorrow, confusion, and errors, and still feel loved. Their upbringing is invaluable when they have that kind of emotional stability.