I think Jacob still loved Bella during her pregnancy. His feelings for her have not change. But I think Bella needed him so much near her because of Renesmee. Even before her birth, she was able to think, to understand what's going on and to love Bella (as Edward realizes). So she was able to love Jacob already. After Bella's transformation, when she understand that Jacob had imprinted on her daughter, Jacob said something like (sorry don't have my copy) : do you remember how you needed me just a couple of days before ? It was her (Remesmee). You don't feel this need anymore, do you ?"Adrienne wrote:I know that there are theories that Jacob and Bella were so attached during her pregnancy bc of Renesmee but I didn't feel like it was. I don't know if it's been confirmed or not (if so someone please speak up so I can get it right ) but I thought Bella not being able to let go of Jacob as a human weakness. Edward told Bella that it was okay that she loved Jacob too, she was only human (so I assumed he was referring to it as a weakness.) I always measured the love that a vampire has for another the same way as imprinting. Just as killing the person a shape-shifter imprinted on is unforgivable, so is when someone kills a vampires lover. Jasper mentions that it is the one thing their kind does not forgive. When one of the shape-shifter imprints, Jacob describes it as a a blind man seeing the sun for the first time. When Edward describes his love for Bella *MS SPOILER* he says that it was like the sun rising in the middle of his midnight.* So when Bella is transformed, she realizes that she loves Edward even more than she did before, that her human heart was not capable of containing that much love. Jacob was even about to shift, feeling the tremors in his body, and then he looked into her eyes. Idk but I think for imprinting it has all to do with looking into the other person's eyes and then you see them in a new way.
So my theory : during the pregnancy, Jacob loves Bella as before. Bella loves Jacob only as a friend (because she's now happily married, pregnant...) but Renesmee messes up her feelings for him. After Nessie's birth and Bella's transformation, Jacob imprints on Nessie and Bella loves only Edward passionately. Bella and Jacob are just friends and everything is prefect.