Now that way, Ishqedaar is someone who has love, who is part of that love, and ishqedaari would be the thing that he has, that is love. So after a turn around, ishqedaari is more or less, love. Just like zimmedaari which is responsibility, more or less same as zimma.
Ishqedaariyaan (or ishqedarriyaan, as they have spelled it), thus, which is nothing but the plural for ishqedaari, means 'loves', as in, the loves that the partners in love have.
And just in case you thought all that was blabbering, just call ishqedarriyaan as love.