The problem in this sentence is the use of REDUNDANCY because the two phrases "over and over" and "repeated it" mean the same thing and pretend to give the same idea. The speaker repeated something so many times that he/she could not keep my attention.
Other examples of redundancy expressions are: "actual fact"; "blend together"; "final outcome". The repetition of words/expressions is needless, so you can do away with any of them. In speaking, redundant structures may be overlooked, but you should be careful in school or university writing. Eliminating redundant structures (which are wordy) helps your writing to be more clear and precise.
