You can be a loyal person and still get screwed over

My last day working with this boy at work. I really liked him, the others not so much. Defended him and stood up for him when he came up in conversations when he wasn’t there, where I absolutely did not need to. He knows that I like him and today he left without saying bye to me, didn’t even give me a chance to say bye to him or wish him luck. Just goes to show, you can treat people nicely and be kind to others and stand up for others but at the end of the day, loyalty means nothing.