Is normal that a guy doesn’t want to date aftet one rejection?

My brother got rejected by a girl he really liked. She liked him too for a long time. They kissed few times and went out. But then she ended things. It happened like 10 months ago. Since then he doesn't want to hear about dating a word. He id handsome guy and he could have many girls if he wanted to. But he is became really bitter towards this all. He is like if she rejected me every other will too. All he does is hanging out with boys watching football and drinking.

Is normal that a guy doesn’t want to date aftet one rejection?
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