From Suman's pov all drama between Shivi happened only because 'Raavi ne mere Shiva ko dil se nahi apnaya', he fell for her but she didn't reciprocate his feelings, 'wo samjhi hi nahi iss khare sone ko' 'jisne maut se bacha kar iska haath thama uski kadar na kar payi'
She doesn't know Raavi's pov or her feelings but as a mother she knew Shiva fell for Raavi n now he won't be able to love anyone else again, also that Raavi not reciprocating his feelings was killing him, as per Suman every action of Shiva was in retaliation n frustration because Raavi didn't love him, and it frustrated Suman too, nothing she tried to make Shiva forget Raavi or move-on from her worked and that was her biggest fear that Shiva will be deprived of love for his whole life, thats why she liked Disha so much, because as a mother she knew Disha was crazy about Shiva n she hoped that she will treasure Shiva