Echoic memory is the memory that relates with auditory stimuli under ultra-short-term memory.Through this memory, brain is able to catch and store audible information in mind in the form of instant echo for very less duration of time .
According to the question, echoic memory still holds the spoken information by someone even if Nadia wasn't paying attention to the words.Thus, there are chances that might be able to repeat words.
Maybe you should try contacting his/her parents and seeing whats going on or unfortunatly he could've broke up with you without actually telling you he broke up with you.
