What does it mean when a guy responds "meh"?

Anonymous
When we're texting and he responds meh, I take that as a hint to end the conversation. I usually don't text back. What does he mean by meh?

Also he has used K a lot on me and I hate it.
And if I tell him goodnight or something he never says it back
What does it mean when a guy responds "meh"?
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