This is a relationship, like any other. As such, I would recommend honesty. It will be far far easier and less painful for everybody in the long run - especially for you.Remember, we only get one shot at this life. If you're in 'a rut' is it not possible that they are too? You may be doing them a favour.
Good luck with your music.
Catrin Who knows that advice is easier to give than recieve.