Husband is Polly....

So I am not Polly, never even heard of it until my husband brought it up maybe 6 months ago. It all started because out friends are and my Husband wants to be. He wants to have a relationship with my long standing friend. Who I also no longer feel like we're friends. He says nothing will change between us yada yada I'm his home. My question is how do you deal with this when your not. Because I honestly want nothing to do it and want to run a 1000 miles in the opposite direction. We have one daughter together and I know a divorce would hurt her.