In the third installment of Twilight called Eclipse we see a competition between Jacob and Edward. Both are in love with Bella and want what is best for her. Edward doesn’t want to change Bella and Jacob doesn’t want to see her become what he calls a leech. This movie is solely based around protecting Bella from a revengeful Victoria who is mad that Edward killed her mate James in the first movie.
Victoria has recruited Riley and created an army of newborns to come from Bella. She wants to destroy Edwards mate like he did hers. Jacob and his wolf pack team up with the Cullen’s to keep Bella safe from this army.
Bella is forced to confront her feeling for Jacob after Edward asks her to marry him and she says yes. She des love Jacob but it’s a different kind of love and she must convince him that she belongs with Edward. her love is so strong for Edward that she cuts herself with a rock in order to distract Victoria and Riley from trying to kill Edward.
When Jacob is hurt at the end of the fight Bella must deal with the fact that she may lose her best friend by choosing to marry Edward. But Jacob tells her he will fight for her until her heart stops beating. And maybe even then.