Don't be worried, you don't have to become enemies. If he really doesn't care, there is little you can do to make him care. He might be in love with someone else or not ready for any comitted relationship. But do you show him you really care? If you always show you care and he still doesn't care, then I will advice you to move on.
And don't just assume he doesn't care, be certain, talk to him about it.
Don't insist if he doesn't care. You'll find someone who'll treat you right, don't give up. Stvtistic