No, but his economic dependence on you is a serious issue in itself. He is not your husband and you don't have any legal entanglements to consider and the division of any property probably won't be as much of a headache as for example a marriage split up.
Saying he is manipulative is really half the picture.
Have you sought help from alanon? This issue of dependency and freeloading is really a very common topic on F&F...I'm sure someone else will come along shortly and offer some experienced advice.