Why is this guy or someone who says we’re in a relationship stop talking to me over something stupid?

I saw this guy and hanged out many times. Over 10 times and he says we’re in a relationship but recently he asked for a selfie and then he replied with kiss emojis but he hasn’t texted me in two days… should I consider us broken up? What are the possible reasons he stopped talking…

Why is this guy or someone who says we’re in a relationship stop talking to me over something stupid?
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