Bella is in love with Edward she would be unhappy

she would always wonder about her life with Edward i think

If the world was normal, withoud vapire/werewolf thing, they would be together and they would be happy.

Probably if Edward never came back and the imprinting didn't happen

I've always wanted Bella/Jacob. I think she would be happier if she didn't have to give up on all the human experiences.

I dont reallly know because she loves edward but jacob can keep her safer

I think that with no matter who she ended up with she would always wonder what her life with Edward would have been like. I think it's like that with everyone and their first love to be honest.

Based upon how content she appears at the end of Breaking Dawn and how much she loves her life I would say no. Not to say that she wouldn't be happy with Jacob, but she definitely wouldn't be happier.