Elena does not want to be a vampire. She wants to grow old and have kids. She told Stefan how she felt, and he accepted it. Damon, yes he loves her, so he decided to take matter in his own hands, and fed her his blood. She didnt want that. And Stefan didnt want to just give Elena over, she didnt want him to risk his life for her. Stefan did have a plan though, too bad Elijah didnt follow through with it. Elena loves Stefan, but is starting to feel something towards Damon. But you can't say that he loves her more than Stefan does.