S.B.
It's normal.
He'll come back around to affection and then change again when he's a certain age in school.
Then he'll go back again.
My son is 16 and he still loves snuggling and hugs me in the morning before school. He's taller than me now so he finds it funny to make me stretch to reach his cheek for a kiss, but at night....guess who wants his back rubbed and scratched before he goes to bed.
My son is all boy/young man, and he is on the road to a career in law enforcement, but he still loves his cuddles.
He'll be a very affectionate husband and father.
Don't worry about the phases.
They will come and go.
Best wishes.