The word trust includes respect, integrity, and honesty. When the two of you are trusting each other, you don’t keep secrets from each other.
If you and your partner are in a healthy relationship, then it is obvious that the two of you can talk about anything and everything with each other.
It crucial for a relationship to be well-balanced, where both the partners are equals, where both of you love each other, without letting go of your self- identity or esteem.
When the two of you are in a healthy relationship, with time and maturity you will understand that spending time apart is also very important as spending time together.