This may answer your question.

https://www.reddit.com/r/AskHistorians/comments/1pw9a4/what_was_kaiser_wilhelm_iis_reaction_to_the/

To be honest, though, anything he truly felt was probably incredibly private, much like we do not know what was said between Nicholas and Alexandra after the former had abdicated in March 1917, it is unknown what Wilhelm truly felt. Unfortunately, we don't always know what happens in the royal's private lives.