Your empty spaces are always mean't to be filled. There's empty spaces in your brain for more knowledge to come, so what's the problem with having some space in your heart? It just means that you have enough room to grow and love everyone.
She was a silent fighter with a demon in her lung that stole her breaths from her before they passed her tongue. He was a silent fighter who was always taught to share so he held his breath when he was with her so she could have his air.