Don't think kabir is having any romantic inclination towards roshni yet.... Him breaking chall seesha was because he was angry and agitated that roshni was easily warming up to aman.. Which he doesn't want till TBR.... Otherwise aman won't be preoccupied with roshni... Also kabir doesn't want his identity to be revealed to aman or anyone at home, which only roshni knows... He doesn't know that aman knows he is jinn n killed tabeezi, yet, judging from precap... So according to him he is just keeping his mask on by protecting roshni again and again n not wanting her memories to come back.... Her memories came back in chall seesha n he again wipes her memories... So far I don't think the CVS has given any explicit proof that kabir is lusting after roshni or even have some feelings for roshni... He is just controlling her so that aman would be preoccupied with her... N he just wants aman to suffer, if roshni control thing doesn't work... May be that's why he said I will snatch everything from you, aman...