Widow of the Empyrean by Nikki Collins Mewha
Lovers separated by fate, brothers separated by destiny, an Empire on the brink of collapse, and one man with eternity to make sense of the important things in life.
The world as we know it is nothing more than a curiosity to historians. Humanity has gone into space out of necessity. The survivors watched as Earth was destroyed, and then turned their attention towards living in this hostile environment. Peace has descended on the solar system, and the two major fleets work as mercenaries for whoever has enough money to pay them.
This is about to change.