Is my boyfriend ignoring me?

We're in a long distance relationship. It works well, but I noticed he started to ignore me on social media. For example, he uses Instagram to like photos or follow people and never miss it, but he doesn't answers my messages there or do it late. He has notifications and using the app everyday, but also didn't answer a comment that I tagged him. I don't even do these often. Maybe once or twice a week. I don't wait too much attention from him... Why do you people think about that?

by the way, we were having call everyday before. Sometimes for hours, sometimes only to hear each other's voice because we may not have time always... Now he started to call once a week because of his busy schedule. We talk a lot on WhatsApp, but only there.
Is my boyfriend ignoring me?
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