What troubles me about all this is that he wants to call it poly. It isn't poly for a man and woman to have a friendship. I have lots of close male friends that I am not interested in having sex with, but I am very close with. There is nothing wrong with that. Even if there is sexual tension I know where I stand and I am firm with them.
Poly is a sexual and intimate relationship. I would certainly question his motives if he wants to call it that.
You certainly don't have to look into another partner if yours is. Why would you want to do that? Its like the whole question of would you jump off a bridge if others were.
Be yourself always. Its as simple as that. What's hard is knowing who you are so you can be yourself.
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