Doesn't necessarily mean poly
Mike, I just wanted to point out that poly isn't a necessary outcome of one partner in a relationship being bisexual. If you both want to be poly, that is great; but, many bisexual people are not poly and are perfectly happy. Being bisexual doesn't mean you have to love or be intimate with people of both sexes simultaneously, just that you can be loving or intimate with either sex.
I am not trying to discourage poly, btw. I am, and believe it can be a great lifestyle. But, it's not a foregone conclusion of being bisexual, which is a bit like how your posts read to me.