Hi.
You have answered your own question - this lad doesn't make you happy. What else do you want but to be happy? all you strive for in this relationship should ultimately be for your happiness. When you stop the chatter in your mind - stop, slow down... think. Take time to see what it is that you don't want anymore. Then ask you move forward, you can recognise what it is that you DO want, as apposed to what made you unhappy before. Take time for yourself, do not dwell on what has been done and do what makes you truly happy :) Give yourself time.