This is the most sensitive territory. Once a son hits puberty, the dynamics of the body and the mind change. While emotional closeness is still vital, the physical boundaries must shift. Continued nightly bed sharing at this age can confuse the son’s developing sense of self and sexuality. It is almost universally advised to transition to a "visit" model (he starts in his own bed, but can come for a hug or talk) rather than a full night share.
Start by sitting next to his new bed until he falls asleep. Over several nights, gradually move your chair further away from the bed until you are outside the room. mom and son share a bed
Family Bedsharing: Navigating Co-Sleeping Practices as Your Child Grows This is the most sensitive territory