No one.
No one will look out for you, not even your partner.
You are your only friend.
You are the only person who cares about you.
You cannot trust anyone but yourself because if you don't do everything for yourself you will drown.
You need to look out for yourself, think only about yourself, and not give two shits about anyone else because quite frankly the world will eat you up,
rip you apart,
spit you out
and let you bleed to death.