Why did my ex tell me he missed me and then never text me back?

My ex texted telling me he missed me, I told him I missed him too, he told me he wanted to keep talking to me and I told him we could, he asked for my snap but never added me, so I asked hey ___ I think you blocked me, he said what i didn't. He told me it wasn't letting me add him, I said same, he told me m"aybe its bcs you blocked me 😐." I said, "girl. I dont know why you're giving me a attitude but I didn't" he didn't text me back ever since he saw, three weeks went by and I accidentally sent him a funny weird video, and he said, "bro what the heck" I told him it was an accident, that was the last time I've ever talked to him, why did he do this to me? I'm so attached to him.

Why did my ex tell me he missed me and then never text me back?
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