Lovable nerd Peter Parker has had many romances since he became Spider-Man, with Mary Jane Watson being the longest-lasting of all his relationships. But strictly speaking, Spider-Man has only had one girlfriend, and it isn't Mary Jane. It's the Black Cat.
In the role of a superhero, maintaining your secret identity is crucial to keeping your loved ones safe from your enemies. Because of that, it is necessary to keep the two parts of your life as separate as possible. For example, while Peter Parker is dating Mary Jane, people can't also see Spider-Man dating her or someone will figure out his secret identity. Most of the women that Peter has dated were individuals that he met and started seeing as Peter Parker. If they found out that he was really Spider-Man, it was only after they had already started seeing Peter.
Related: Black Cat Just Bested Marvel's Batman
The one exception to that rule is Felicia Hardy aka the Black Cat. She first encountered Spider-Man in 1979's The Amazing Spider-Man #194 by Marv Wolfman and Keith Pollard. Felicia was raised by her father to be one of the best thieves in the world, which means running into Spider-Man frequently. Upon meeting Spidey she is instantly attracted to him and eventually confesses her feelings for Spider-Man in The Amazing Spider-Man #226 by Roger Stern and John Romita. At this point, Felicia has never met Peter Parker and is only interested in Spider-Man. Peter starts to return the Black Cat's feelings after she turns her life around and starts to fight crime with him. During this brief period they swing through New York side by side throughout the night. The Black Cat is the only love interest who wants to be with Spider-Man and not with Peter Parker.
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