It sounds like many, many years of being six have wizened her beyond her time.

So I hear you say she is like your best friend and you could not stand for her to be different or changed.
I hear you say he is a part that split off from her.
You love him ( because you love all of them ) but you do not like him.
You cannot stand his whining, neediness or selfishness.
You love Sonseearae just as she is.