Why didn’t he respond to my “bye” message?

Why didn’t he respond to my “bye” message?

yes it was hard, I liked him somehow
but after two months I realized it’s time to accept that he isn’t interested that much and doesn’t see me more than a friend of his.
so I told him in the last messages good luck I am happy we met and bye he replied to the first two messages but didn’t say bye.
I won’t respond even if he is willing to message me again.
what do you think of his behavior?
Why didn’t he respond to my “bye” message?
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