The Question and Answer section for Insurgent is a great resource to ask questions, find answers, and discuss the novel.
What Is the turning point of insurgent
Yes, Tris truly loves Tobias. She sent a clear message through Caleb to Tobias saying she wasn't just a Dauntless adrenaline junkie. This was true sacrifice.
Peter helped Tris and Tobias escape because he did not want to be in Tris' debt.