Maybe he is excited about his new partner. He is very insecure. If you have longtime male friends that he knew you had before the engagement, then I think you should be able to keep those friends. That is a spooky thing that he would request that you cut off relationships, especially if they are platonic. You need to define rules and roles, so speak up about how you want things.
Age is important for most people because it is a closer match of their life goals.
That is one of my phrases. You need to give more and expect less. She states she needs her space and time. I'm not sure how you caused it. If there is something you did that was offensive or demeaning to her, then that might be a high mountain to climb, but if she just got cold feet, then maybe you should find out where she is now and if she has warmed up to the idea.