Oh... guys I forgot. Have you ever noticed that in EVERY Spider-man film made so far in this modern era Peter Parker cannot keep a simple secret. Don't let people find out your Spider-man, he let's every enemy find out endangering his family and friends, he lets numerous other friends and family people find out too.
Peter Parker from the comics kept it secret for years, only like 2 villains found other before and most other times he had to reveal it, people didn't believe them/him. Mary Jane worked it out.... it took 200 issues plus for her to do that.