Did text message send on my iPhone?

Awhile ago I was texting my friend and after a few texts they stopped replying so I left the conversation alone. Today I was looking back and the last message l sent before they stopped replying is gone from my history. I'm wondering if it actually sent or not.
It never gave me the red exclamation point, it just said it was sent, but looking back it's not there.

Government seized it for evidence

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