He unliked my photo when I didn't reply his text?

This guy used to text me every day, but lately he can go for days (less than a week) without keeping in touch.

I was feeling sentimental and posted a photo on Instagram with a caption. He liked the photo, and a few minutes later texted, "Why so sentimental?" I didn't reply because I didn't know what to say, and I planned to reply two or three days later since he can do that too.

One day after he sent that text, I noticed he unliked that "sentimental" photo, but didn't unlike the other photos besides that one.

Why did he have to unlike my photo on purpose? I know I didn't reply him but it's only been a little over a day. He can go a few days without texting me.
He unliked my photo when I didn't reply his text?
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