Rejection is a defense strategy of your ego (whose job is to protect you as it is a defense mechanism). Sometimes you reject someone by fear of being rejected because your ego thinks that anticipating will be less painful, but guess what? Maybe the other person has no intention to reject you? What if it was only a fear preventing you from living and just being? What if you were the only one rejecting yourself?
When in doubt talk to the other person and sort things out with love and peace and you will see, things are never as bad as you think.
One more thing... When you reject someone, you reject a part of yourself that you consider as not lovable. Become aware of it and integrate this very aspect of yourself.
When you accept yourself fully and work on your own growth, your ability to love another is growing too, and that's how you can love unconditionally.