If you suddenly disappear from a guy's life and it doesn't affect him does that mean you didn't matter?

So basically. This guy did matter to me to an extent. I think so much was going on in my life that it was all jumbled, what mattered and what didn't.

I suddenly disappeared. This guy I honestly thought it barely affected him I'd see pictures of him smiling happily with his girlfriend etc. just days after I disappeared.

However when I saw him a really long time afterwards in an isolated mall, he was looking at me like the world stopped for a few seconds, like he saw a ghost.
If you suddenly disappear from a guy's life and it doesn't affect him does that mean you didn't matter?
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