im bere confused!!

hey guyzzz...i dun reli watch this dramam but i watched sum episodes of krishna wiv radha...n it showed krishna and radha were in luv with each oder...i luvd those episode....but hu is dis RUPMANI?? n is she in love with krishna?? wer is radha?? i dun get if krishna luvs radha then y is he in luv iv rupmani now??