Why did he stop liking my selfies all of a sudden?

This guy that goes to my school follows my instagram and he used to always like my selfies. Not my other pics only the selfies. I've never talked to him or anything but we know of each other. Recently, a guy im talking to started commenting on my pictures sweet things like "beautiful" or "your eyes are amazing" andd i reply back to him with hearts so it kinda looks like we're a thing. Ever since this guy started commenting on my picture's, the one from my school doesnt like them anymore. Why? What does this say about what he thinks of me?