You just anwsered your own question
A partner does not make your life, it should be complete without them. Try directing your energys elsewhere, such as in a new hobby or a passion. Join a gym, keep busy and improve yourself. You may find he looks up and starts paying a bit more attention.
Allthough its hard to step away from 'clingy' behaviour, its best to. Just think of the tug of war. The more you pull the more the other person pulls the other way. Eventually one will loose out and you could be that person.