You're really getting twisted trying to find a justification for your position.
Why do you say this ... ?
... because I go to the root of the issue (i.e. love) ... ?
... to determine God's intent for marriage ?
Did not Jesus do the same when the Pharisees asked Him about divorce (i.e. go to the root of the issue) ?Matthew 19:3 The Pharisees also came unto him, tempting him, and saying unto him, Is it lawful for a man to put away his wife for every cause?Your attempt to justify polygamy is similar to the Pharisees attempt to justify divorce.
4 And he answered and said unto them, Have ye not read, that he which made them at the beginning made them male and female,
5 And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh?
6 Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.
7 They say unto him, Why did Moses then command to give a writing of divorcement, and to put her away?
8 He saith unto them, Moses because of the hardness of your hearts suffered you to put away your wives: but from the beginning it was not so.
9 And I say unto you, Whosoever shall put away his wife, except it be for fornication, and shall marry another, committeth adultery: and whoso marrieth her which is put away doth commit adultery.
Thou shalt love thy neightbor as thyself ... is the second of the (2) great (or primary) commandments of God.
All of the other commandments are built upon these two ... and loving God ... and loving your neighbor.
Per this basis of love, ... unless you are willing to subject yourself to the sharing of a wife with another man, ... there is no way that you can justify polygamy as God's ideal.