as salaam alaikum

Mr
As salaam alaikum, I have been married to my husband now for 17 months he is now talking about wanting another wife but I don't want him to take on another wife... I just started getting used to having him constantly around and being next to me when I'm sleep. I love waking up for fajr and him leading me in my salat we always make fajr and ishaa together every day except for when my Mense comes but I still am up with him for fajr... he has been saying he wants another wife for the last week and I keep getting upset about the convo but today he said he wouldn't take on a 2 wife because he sees that it upsets me.. But now I feel really bad because I stopping him from something that's permissible for him to do... I just need some opinions / advice on how to remain neutral and what for my sister what I want for myself