I hope one day he will like me. For who I am and for who I am not . For being myself.
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I hope one day he will like me. For who I am and for who I am not. For being myself.
The entire phrase "who I am" and "who I am not" is the object of the preposition for.
Note that the contraction I'm is inappropriate in the end position of a sentence/phrase/clause.
I hope one day he will like me. For who/whom I'm I am and for who/whom I'm not. For being myself.
Either "who" or "whom" is possible, though the latter is excessively formal.
You have a couple of errors. You can't use the contraction "I'm" in that position -- it must be the analytic "I am". I'm not sure exactly what you are trying to say, but I think you may also