Should my romantic partner be interested in and supportive of my accomplishments and pursuits?

I have struggled for years in a relationship with someone who shows no interest in or support for my pursuits. I try not to be hurt. I tell myself I just need to do better in order to be worthy of respect and admiration. When I do explain to my partner why I'm hurt, he says I am being needy and that I shouldn't need his praise or reinforcement. I don't know how to logically disagree with this, yet I know how good it feels to receive earned praise from friends, and how painful it feels to accomplish something big and not receive any acknowledgement from my partner. What kind of emotional support should be expected from a partner? If a partner is dismissive and neglectful, how can one gain the confidence needed to leave the relationship?