Can your ex tell when you've moved on?

My ex is hitting me up more than usual and I'm talking to this new guy which I find weird timing. I used to hit him up a lot and I stopped so maybe that's why he feels the change within me. Like I don't care anymore. I've had enough of him. I just can't seem to block him because we've been friends for so long.
Can your ex tell when you've moved on?
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