While technically you really don't have a say in his personal life or when and who he dates anymore, I feel he is being totally disrespectful to you, since you have a not so long ago history and you are doing him a HUGE favor. I would stress that right now his priorities should be looking for a permanent place to stay, not a place to park his ****. Tell him you want him to be happy, but he should also want the same for you and at least have the decency to give you that respect while he is staying in your home. If he can't do that, tell him he has 30 days to find a new place. Don't put up with him guilt tripping you and walking all over you.