At his age it's time to sit down and think about we're your son is now and does he really have a future in lacrosse! Does he have the speed and skill to play at the college level, and does he even really want to still play or he's making you happy. If he's on a B team and he's not one of the top two or three players on the team that might be a good sign he's had enough!
Great advice. Is he getting playing time in HS?
I think we all want our kids to excel and play in college. Beware of what you wish for.
For every happy player in college there is 4 terrible experiences.