Why would a guy ignore a LinkedIn message from a former coworker he once liked?

So girl and guy work together, he writes an email on his last day that he likes her. She has a boyfriend so…nothing happens. Later she reconnects with him via LinkedIn…she writes low key message, she knows he’s seen it but he doesn’t reply.. why? Not even basic hey!

Why would a guy ignore a LinkedIn message from a former coworker he once liked?
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