While at my previous work, my manager deleted a message in such a way that it would make the conversation appear hostile from my part. We were already not in g

While at my previous work, my manager deleted a message in such a way that it would make the conversation appear hostile from my part. We were already not in good terms, and it was a small company so there was little to be done. But having seen the message and knowing the intention, and not being able to prove it felt horrible. I since left (after discussing with the boss).