Not OP but:
One of the big points of the franchise is that Scott is a loser. He's jobless and is leeching off his best friend by living at his place, he dates a high school girl because she likes showing him attention, then he ignores her and cheats on her with Ramona.
When the movie came out, people thought Scott was a cool geek fighting to get the girl... That wasn't the message at all. The comics go way more in-depth because the movie didn't have much time for it.
It's also implied that Ramona is kind of a loser too that runs away from her problems and waits for someone to fix them for her, hence making Scott deal with her "seven evil exes" instead of confronting them herself and making up with them.