Since the first time Johan invited Clarissa to his house, then introduced Clarissa to his parents, Amel and Anggara immediately liked him. The girl has managed to win the hearts of both Johan's parents. The more often they meet, the greater Amel's affection for the girl becomes.
Nindy had already known Johan's parents because Nindy had often played at Johan's house since middle school, but still, the first woman to win over Johan's parents was Clarissa, not Nindy. Johan has received his blessing to be with Clarissa until the marriage level.
That's why when Amel found out that Johan had impregnated Nindy, she felt very devastated and angry. What she was thinking about was not only about her family's reputation but also about how broken Clarissa's heart would be if she found out about it.