After Bella transfers to Forks High she is is approached by almost all the boys at her new school. The student leader Mike Newton, has a strong attraction to Bella. Lovable Lawrence with his enthusiasm and spirit asks if he can escort her to the prom. Eric the lovable geek, and a good student would love to hook up with her. As well as these boys, Bella could provably could have choosen Pat or a dozen others boys for a boy friend.
And that is because Bell is the "shiny new toy" that every one is interested in. And because Bella is far from average. Even though she doesn't know it she is actually quite pretty, and is very very special
As Bella gazes at the school's reading list, she discovers that not only has she already read every book on the list, but that she has also written essays on each of their major themes. Biology classes for Bella, and her lab partner (A man named Edward Cullen) are nothing more than review sessions. Bella has already taken an advanced placement biology class. And the fact that her partner has two doctoral degrees in Medicine, gives him an advantage not only over the other students, but also her teacher Mr. Banner.
Bella is a seventeen year old girl, but she is also an adult woman. She has been the emotional caretaker of her mother for years. And within hours of arriving at her fathers home she assumes the role as the caretaker of his home as well. And she has read and re-read all of the classic literature so many times that "the spines of her books can no longer hold themselves up."
Bella is attracted to Edward and he to her. But Edward leaves.
Bella still has the choice of virtually any boy at school. MN to BS : So your back. GOOD. Let's go to a movie. Bella is alone and she can choose the company of virtually any boy in school to provide her both affection and company
SO WHY DID SHE CHOOSE JACOB ?
How it all started was the fact that Bella wanted to do live threatening activities so she can hear Edward's voice so she got the old motorcycles, wanting to fix them up for HERSELF. When she realised how much it was going to cost to get them fixed she remembered that she knew someone good enough to ask them for help. (Jacob) So she took the bikes down to La Push. After deciding they will work on the bikes everyday, they became closer and closer because they were now spending a lot of time together because Jake was helping her with the bikes.
Now in New Moon, when the bikes were finished Jake asked Bella in her truck on the way to test them... "If I told you I could not have fixed these bikes, what would you have said?" Bella replied "Are you doubting your mad skills?" Jake replied "No. Definitely not." (He said a little something extra, can't recall) then Bella answered "If you told me you coud'nt fix these bikes, I would have said that that's too bad but we'll just have to find something else to do"
Now in my opinion that was a lie. If she did not get the bikes then she and Jake would not have become such close friends and if Jake had told her he could not fix the bikes then she would have been on her way and she and Jake would not have become that close. She probably would have just spoken to him when he and Billy come up to visit Charlie.
So all I'm trying to say is that Bella did not choose Jake. She was not looking for someone in the first place but because she seeked help and Jake could have helped her, after working on the bikes everyday they became close friends and she found strength from hanging out with him.
That's my answer.