Amazing Spider-Man (1963 Series) #258
By Tom DeFalco & Ron Frenz.
"The Sinister Secret of Spider-Man's New Costume!" Peter vs. The New Black Costume.
As Peter tries to stop MJ from leaving, the Black Cat arrives, confirming MJ's beliefs that he is Spider-man. Both depart, but Peter stops the Cat by inadvertently shooting webbing at her, convincing her that he cares.
