To love someone is to recognize that they are not here to complete you, fix you, or fulfill you. Instead, they are here to walk beside you as a fellow imperfect person with their own wounds, their own nervous system, and their own unconscious patterns.
so far in my 20s, the best lesson i ever learned was that life will go on. People come and go, we lose friends, break up with lovers, meet new people, encounter success and failure and life will go on. You will be alright.