When I watched the first one, it was amazing and I think that the second one will be too. But at the end of the first movie, when Peter told Mary Jane that he wanted to be friends with her and she was sad about, then I screamed "YOU IDIOT" and then I realized why he did it: He wanted to protected her, so he decided that he couldn't have a relationship with her because of his other responsibilities. I think that MJ knew about it and decided to try moving on!
I agree with Spiderman RJ, its obvious that MJ is suspicious, she doesn't FULLY think hes Spidey but probably thinking "hang on, somethings not right here."
She begins to suspect Peter is Spider-Man in the first movie at the end when they breifly kiss. To MJ, the kiss is similar to the one she had with Spider-Man when he was hanging in the alley. This whole storyline will be carried on in the second movie.
__________________ Oh a hot summer night, would you offer your throat to the wolf with the red roses?
It takes her a little while--MJ isn't always the "brightest crayon in the box"--any other woman in the world would have been able to identify him by his voice, build and his scent.
In the second movie we'll see that her relationship with John Jameson is almost to spite Peter. She agrees to marry him after a fight with Peter. She only wants Pete, but figures that she needs to make him jealous so that he will come around.
__________________ Using the great power, ignoring the great responsibility.