Why do some guys not show emotion?

This guy I’m talking to is hella cold like in person he’s touchy flirty very nice we joke around a lot but when I’m not around him he barely talks to me or text me like I was leaving for a surgery a week ago and he hasn’t texted me since he said it was gonna cost a lot I told him get WhatsApp and he said laughing he’s bad with technology which is bs my 4yr old brother can use technology even and today when my friend asked him to call me he said “why” like tf is that should I give him a chance when I get back or cut him off cuz this is such annoying attitude just cuz ur a guy don’t mean u don’t have feelings or emotions wth I don’t even know how to act or what to say when I see him at work when I get back to USA like how do I act why did he make it so awkward I need to know from a guy’s perspective

Why do some guys not show emotion?
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