That person is with you 24-7.
That person knows all your secrets, faults and flaws (and lives with them every day).
That person is the only one who can support you and offer you solutions that work for you.
Perhaps people misunderstand what it means to love yourself unconditionally.
Many think that loving yourself is ego-centrism or selfishness because they confuse what love should be.
However it is not hard to understand.
Love is more than the typical understanding that we place to it.