I think she needs to find another place to live pronto. It sounds like the breakup is no longer hugely traumatising for her. She's excited to go on dates again. So she can get her own lodgings with someone else, where it's purely a commercial arrangement, not a friendship, because it's putting too much onto you. Sorry you're feeling so bad. You can still see each other as friends, but you don't have to live together. Living with anyone puts a lot of pressure on the relationship. You're not married to her - you don't have to do this.