Do you guys get jealous or insecure when the one you love or the one who loves you goes out of town?

Yesterday he's so nice to me he's even happy were close again, we have dinner with he's father, but when I went out of town with his sister, he suddenly changed his mood like he's so upset to me, he's always like this when I hang out with friends? He even contradict to every words I said, I can't ask him because he never talk any emotional thing. he's introvert and quite person. He only let me hug him and he's affectionate when he's drunk. Why he can't even look me in the eyes?

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What do you think why he's upset with me everytime I go out somewhere?
Do you guys get jealous or insecure when the one you love or the one who loves you goes out of town?
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