Disclaimer: I do not own Harry Potter, everything belongs to J.K. Rowling :)
As they looked into each other's eyes, for what could be the last time, Lily tried to convey to James all of her emotions. She was proud to have a husband who would fight He-Who-Must-Not-Be-Named wandless, so that she and their son would have a chance to escape. Distraught over what was about to happen to her family. Afraid of what might happen to their son in future years, growing up without his parents. Accepting that this would be how her life would end, with her husband already dead downstairs, and a son who watched on as she was killed.
But most importantly to Lily, she was in love. In love with the boy who had asked her out nearly every day for just over 6 years. In love with the boy who, even when she denied her true feelings, had never given up on her. In love with the man who gave his life to try and save hers. She was in love with James Potter.