How old are the two of you?
He could be depressed and/or over whelmed. Or it could be any number of other things.
Since you have no idea what is going on, he’s not talking and his actions point to either depression or he’s done with the marriage… I think you have to wait things out for a short while. Let him see the counselor.
The semester, his last, is about to start so don’t disrupt it.
My suggestion is that when in limbo do the 180… see the link in my signature block below. It says it’s for when there is infidelity but really it’s for when there are all sorts of problems in a marriage.
I also suggest that you read the book “Divorce Busting”. The 180 comes from this book. The book explains it and a lot for in detail.. detail that will help you.
For you get busy in your new community. Go to Do something, Learn something, Share something, Change something - Meetup
if you need some help finding things to do in your community in your spare time. Make friends. (Avoid potential affair partners as you will be vulnerable.)
The goal is for you to use this time to get your emotions together, give him the space to finish school, then in December see where things are.
Does this make any sense?