They don't even know how they ended up in the past Naruto had sealed away all scrolls and knowledge pertaining to , as it was potentially dangerous , and unfortunately,.
They have a moment together and they become closer after that.
They go as far as insulting each other, but are stopped.
Finding the injured Craig, Billy takes him home and knocks him back out when Craig tries to go after Vicki.
Hes also a loner and still has yet to find his special someone.
They still stay good friends afterwards.