provide my own ending

Well, two part that I've read ended by Robbie and his friend's sleeping. Oh, I will tell you what happened.
The second part starts with the Robbie's narration, h.e. his life while the war was. When he was in the prison, all from there were started to prepare to the war with Germany, which separated Robbie from Cecilia's  letters and meetings. He was separate  from all, whose he loved...Mother, Cecilia.
This part consist of descriptions of time when Turner took part in the Great War.  A lot of blood, fears, pain; every word in this part full of these terrible things. The most excited moment was when Robbie tried to save lives of woman and her son.

<<A woman brushed past him carrying a crying child, then she changed her mind and came back and
stood, turning indecisively at the side of the road. ...Turner guided the woman through the gate. He wanted her to run with him into the center of the field. He had touched her, and made her decision for her, so now he felt he could not abandon her. But the boy was at least six years old and heavy, and together they were making no progress at all.
He dragged the child from her arms. “Come on,” he shouted.
With a free hand he was pulling on the woman’s arm.
The boy was wetting his pants and screaming in Turner’s ear. The mother seemed incapable of
running. She was stretching out her hand and shouting. She wanted her son back. The child was
wriggling toward her, across his shoulder. Now came the screech of the falling bomb. As he dropped to the grass he pulled the woman with him and shoved her head down. He was half lying across the child as the
ground shook to the unbelievable roar. The shock wave prized them from the earth. They covered
their faces against the stinging spray of dirt. They heard the Stuka climb from its dive even as they
heard the banshee wail of the next attack. The bomb had hit the road less than eighty yards away.
He had the boy under his arm and he was trying to pull the woman to her feet.
“We’ve got to run again. We’re too close to the road.”
The woman answered but he did not understand her. Again they were stumbling across the field.
He felt the pain in his side like a flash of color. The boy was in his arms, and again the woman
seemed to be dragging back, and trying to get her son from him. But the woman had no instinct for danger and he had to pull her down again. The boy had gone silent with shock. His mother wouldn’t stand. She wouldn’t move. He threw himself down into the furrow. The rippling thuds of machine-gun fire in the plowed earth and the engine roar flashed past them. A wounded soldier was screaming. Turner was on his feet. But the woman would not take his hand. She sat on the ground and hugged the boy tightly to her. She was
speaking Flemish to him, soothing him, surely telling him that everything was going to be all right.
The boy was staring at him blankly over his mother’s shoulder.
Turner took a step back. Then he ran. A bomb fell on the road, way over in the center of the village, where the lorries were. But one screech hid another, and it hit the field before he could go down. The blast lifted him forward several feet and drove him face-first into the soil. When he came to, his mouth and nose and ears were filled with dirt.

 Where the woman and her son had been was a crater. Even as he saw it, he thought he had always known. That was why he had to leave them. His business was to survive, though he had forgotten why. >>

For me, it is very sad moment. I was very sorry about them. Turner could not help them. It was dead end.

Cecilia worked a nurse and helped to people. Nothing special about her life was mentioned in this second part. She just wrote the letters for Robbie and her one phrase he remembered for always. Cecilia wrote: "I'll wait for you. Come back." Only her letters made him brave and strong.

So, what about the end? With all my heart I would like to read in the end that they will be happy together. They could live in a small house and could love each other forever. Although, I think, this is impossible. Because the life's already separated them, and may be they will never meet each other again. Of course, Turner can get to ship, which will take away all British soldiers, but he may not be there in time or smth else. 

I want to believe in their "forever together", but can't. 

When I will read all novel, I certainly tell you about the end. Will they be together or not.