I don't know about anyone else, but I feel like you are being used by you supposed "friend". She gave him to you because he was a male that she really didn't want and because you will love him and train him. But, if you rehome him, she wants to profit by it....seems to me that she wants you to do all the work .... training, socializing, etc. and the rehoming for her so that she doesn't have to deal with it. If I were you, once you find the right home, I would only ask the new owner for whatever expenses you incurred and then tell your "friend" you rehomed him for your costs. This way, you won't have to worry about not loving him as much as your others, he will have a wonderful loving home to go to and your "friend" will not use you as a middle-man ever again.