That's the point. Gwen Stacy was supposed to show that shit still happens, no matter how good you are, and especially, that you can lose more than one person. It made Peter reluctant to start a relationship, and after all he did and got married and stuff was because he, has a character, grew confident enough to accept the past and look forward. It's actually one of my favorite development in comics, but Disney don't care and it seems that neither do you. Whatever, I'm in for High School Musical with powers anyways.