Why is it that when I get sad and upset my boyfriend is leaving me to go home, he gets mad at me for being sad?

We spend time together here and there, usually all day but then I get sad and upset (not overtly) but he can tell. And instead of comforting me, he becomes upset and irritable that I am sad to see him go…

Why is it that when I get sad and upset my boyfriend is leaving me to go home, he gets mad at me for being sad?
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