What to do when your lover saids im not attracting to you anymore but you have a place together?

Me and my partner have a apartment with one another and recently we had got to a bit alturcation to where one of us had to be removed from the place to clam down but now were back to the beginging and my partner does not want to be in a relationship anymore but we are in a lease and both the names are on there and everyday we are around each other and constantly see each other im running out of ideas on how to cope with and this and take all of this in. Im hurting on the inside and things arent the same. It feels like im a roomate now and just wierd i need to find out how to cope with this immedialty