The someone - the person who rejected you - is not worth you because of how he rejected you. There is a very fine art to rejecting people in ways that do not make them feel THAT HURT and people are, apparently, either 1) born with that skill or 2) try to acquire it as they go through life, or 3) do not care at all.

I belong to category (2) at the current stage of my life in that I am trying to be gentle while rejecting people, and I belonged to category (3) when I was your age (I am speaking from the position of the person who rejects rather than the person who gets rejected because that has been my experience for the most part). I feel very ashamed and sad when I look back at how I rejected people in the past. But at least I am glad that I currently do not belong to category (3).

The person who rejected you is either in category (2) but has not yet learned about it, or, in category (3) for life, but in either case he is not worth you NOW - he is currently at least a little cruel so you would not want to be with him, in reality.

I do not know to what extent it helps, but it is definitely the case that he is not worth you, because people who care and are kind take their time to explain that they reject you for some sort of reason that has nothing to do with your being stupid/fat/ugly, so that you walk away feeling sad and disappointed and perhaps a little bitter, but not DISGUSTED.