Which logical fallacy is used in the text?
Adele never lies. She told me herself, so it must be true.

 - circular reasoning: an argument that supports a claim with the claim itself
 - hasty generalization: a very broad claim based on very little evidence
The text argues that Adele is telling the truth because she says she never lies. However, the "evidence" is just a restatement of the claim itself. This illustrates a type of logical fallacy known as circular reasoning.