Sombra finds himself looking for Spike after he and Twilight get into a fallout, then asks Spike why he was so upset at Twilight in the first place. He wasn't prepared the for the answer he received.
How could she miss it? The seventh element was right under her nose the entire time, supporting her, guiding her, and loving her. When it strayed from its course, destiny itself nudged it back into line. It was always there... It was just waiting.
All his life, Spike has done nothing but work, and has never complained. But he never experienced an actual childhood yet. But that's about to change when the mane six take things a bit to far.