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 .
According to the above context, choose the best option to answer the following question.
Question: What may be the reason for not knowing someone is alive ?
Options:
- They had feelings for them .
 - They were attracted to them .
 - They did n't notice them at all .
 - None of the above choices .


They did n't notice them at all .