The dance
Rk here was trying to prove his rights over Madhu after his jaleousy got ignited, and Madhu even though she didn't want to dance with him, yet she couldn't go against her feeling, she was highly affected by his touches although she hated to be!!!
In this danse, there was rage from Rk's side because of what he witnessed a while before, but at the same time a lot of passion and love as he loves her afterall and he gets affected too by her closeness
The romance (bas haq hai ek mera!)
Rk once again explains to Madhu, this time with words too, that he is the one who has the right to put colors on her first and she is the only one who has the right to shiver at his touch☺️, she tried hard to push him away telling him that she is his ex-biwi, but she could not resist him for so long and she got carried away, he was affected and sincere too in his emotions, although he told her that he doesn't know why but all he knows is that this is his right!!!!!
The pain
Rk as we know left from there when he thought that Madhu prefered to put colors on Sultan, but once he came to know about the Shootout he came to see if Madhu is fine, but he couldn't answer her questions, why does it make a difference to him if she is dead or alive? why can't he see her with someone else?, why did he come in the morning and why did he come back again?..., he couldn't answer, he told her that he himself is looking for answers to these questions, all he knows is that he ... and left his sentence unfinished saying " No Madhu, No". Does he really don't know that he loves her?!!!! or is it that he doesn't want to admit that he loves her?!!!! How complicated a human being can be at times!!! and he left Madhu once again shattered, in tears, neither does he answer her questions nor does he leave her in peace to move on in life!!!
On one hand there is Rk who did the unwedding, hurted Madhu, yet he doesn't want her to be with someone else, and at the same time he is not ready to admit his feelings, was he in denial mode right then?!! or he really didn't understand that he loves her!!!?? the latter option seems hard to believe for someone as clever as Rk who knew that Madhu was falling for him and made her fall even more to take his revenge, the Rk who could understand that Padmini and Malick were in love, it's hard to believe that he didn't know about his own feelings, did he think he is strong enough to not fall for Madhu?!!!!! Or even after knowing that, his ego was still more important for him!!!!
On the other hand, there is Madhu who was hurt, trying to compose herself, move on in life but she couldn't, Rk didn't let her do that, but she herself kept working as a hairdresser on his sets, I guess not only because she was trying to show him that she moved on -which by the way is something one proves only if they care for the person to whom they are trying to prove it-, but also because she wanted simply to be near him despite the attitude she showed, his looks, his touches always make her melt!!!!!
https://www.indiaforums.com/forum/madhubala-ek-ishq-ek-junoon/3754747/beautiful-tender-romantic-sexy