Overprotective
Following Marcus’ infidelity, Janet could not help but feel overprotective of him. As a result, she became overly possessive and jealous, preventing him from talking to any girls. Their relationship was shielded from any potential harm by her wall. Despite knowing about it, Marcus hated it.
The insecurities Janet felt and the fear of losing Marcus fuelled her overprotectiveness.
Whenever he interacted with other women, even innocent ones, she became jealous and petulant.