Hi Jam,
Just caught up on some posts.
Glad to see your bf and you are back in touch.
Now I don't know about every man, but when you read "Men are from Mars, Women are from Venus" (referencing the experiences of many many relationship problems), men generally follow a pattern of "going into the cave" to reflect and sort out their predicaments.
I know I do.
Women generally like to talk all the time, men can shut off at times.
Don't worry too much, perhaps he will keep in touch for a long time, but do be prepared for his occasional silences.