Seeking Sorority Members Advice *Everone's Thoughts are Welcome*

[RareTreasure]

What do you recommend that a person does when the one person you have bonded with for 5 years says "If you join a sorority I cant be with you"?? I've asked this questions to many, and I will tell you what they have said, and what I already know how to answer them.

I know he is afraid of me dedicating my self for a lifetime to anything other than him, he has already lost someone else in the past to something he told them wasn't going to work out, tried it any way, then it didn't work out.
I tell him constantly it will work, but he just "Knows" that me joining a sorority will cause problems in our relationship. People say......."If he loves you, he will stick by you and hold you down," but as much as he is a dedicated, loyal person, the sorority is where he draws the line. He feels that if I do become a member of a sorority, I will not be the down to earth person I am because most people change. He feels that a sorority is not a necessity, its a want....so why cant I sacrifice a want for him. I don't see it that way.
What do I do? I have been researching this Sorority since I was a senior in High School, and not I am a senior in college.....I want to do it, but I cant loose the one person that's been there for me 100% of the time. I cant count on any one but him for anything...and I may loose that. Would I be being selfish it I did it? Would I be stupid because he is a very good person to me? I've tried to talk him out of it, but it never works. I've cried, and talked and he doesn't care about any of it. He just doesn't want me to do it and he feels that it shouldn't be a hard thing to sacrifice because I'm living fine without it now.