It's so painful to be in this position and I think most of us experience this at some time in our lives. Sometimes things change and two friends can be romantically involved but it's not always the way. There are two roads you can go down here. You can tell him but if he really doesn't feel the same way it might spoil your friendship or you can accept things the way they are and keep him as a good friend although if this is too hard perhaps you should see less of him. There's rarely an easy answer to this kind of problem. However there is always the chance that he might start to look at you in a different light so you might think it is worth the risk. In time you will probably meet someone else, someone who will care for you in the way you deserve, but don't give up because sometimes life takes strange twists and turns and there could be something waiting for you around the corner that will change your life forever.