Is it a bad sign?

I'm dating this guy. Initially we were constantly talking and always going out. When we weren't with each other, we'd sext pretty often. Recently, our conversations aren't that great and we've completely stopped sexting. I asked him if he lost interest and told him it was okay if he did, but I needed to know because I didn't want to waste my time. He said he hasn't but doesn't put in as much effort as he used to. Is it a bad sign that he doesn't try to have conversations and doesn't ask for naked pictures anymore?
Is it a bad sign?
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