Based on the context and the answer, generate a question. 

Context: Back in the day , he did n't know I was alive , but I had an embarrassingly big crush on him . When Lawyerly Friend introduced him , I realized my adoration had managed to transcended 10 years and multiple state lines . My full - on crush , tinged with 16 year - old - lust , reemerged .

Answer:

They did n't notice them at all .



What may be the reason for not knowing someone is alive ?