There seem to be two issues going on here. One is that you think your partner needs space. The other is you feel she is not supportive of you going out and finding a poly friend/relationship. Are these things linked in some way you didn't mention? More of a background here would be useful.
Take the risk of thinking for yourself, much more happiness, truth, beauty, and wisdom will come to you that way. - C. Hitchens
Me: Male, bi, 48, flexible