Many adults in their early twenties do choose to get married. However, in the world today it is more common for young adults to live as if married without actually taking the vows. So, your answer is legally recognized domestic union relationships that don't involve marriage. This is called Con-habitation.
Destructive relationships can influence your mental health in negative ways and the way you treat others while constructive relationships can improve your mental health and give you a more positive view on life
