Are Guys Emotionally shut down?

I assume guys would know the answer to this better then anyone... Why are guys so indifferent? It's so easy for a guy to just forget about a girl he claimed to love and move on, while the girl will be depressed and sad for weeks or months... Girls seem to invest so much more of themselves into a relationship then guys do... When my ex broke up, he said just because I'm not bawling doesn't mean I'm not hurting!! Do guys just hide it that good or do they really have the ability to move forward that easy?
Are Guys Emotionally shut down?
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