Spike had his heart crushed thanks to somepony's lies, now he tries to go after another mare. However, this mare has a friend that has taken an extreme interest in the drake.
Spike was once a complete puzzle. All of his pieces fit together perfectly and he fit into life's puzzle perfectly. Then, he lost something, or more specifically somepony. One does not stay the same after losing a special piece of them.
The truth of the matter is, Spike didn't realize that writing The Noble Dragon Code would get him worshipped as a god but, hey, whattcha gonna do? Them's the breaks.