Life is too short to share with people who seem to suck out of you.
If someone wants you near you, it will make room for you. You do not have to fight for a place in his heart. Never, never intrude or prove to someone who has repeatedly failed to notice your qualities.
And remember - not the people who are at your top when you are on the top are your friends, and those who do not leave you even when you are at the bottom.