Little help please

My fiancé has been acting weird lately. In the four years that we've been together I've never seen him act like this. For example he got downsized and instead of telling me this he left the house everyday at the same time and went to basically sit at his dad's law office. And the only reason i found out that he was at his dad's office is because I stopped by to clear some wedding budget issues with my future father in law.
My fiancé also used to love to run and was actually in a running club, but about a week ago he quit the club and just sits at home. He guards his phone like his life depends on it which is also out to the ordinary. I just don't know what's going on with him.
Has anyone else experienced anything like this and can give me some insight.