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https://en.wikipedia.org/wiki/Silsila_(1981_film)
Chopra (the director) called his ability to cast the three his greatest achievement. He described the production as "real life coming into reel life" but said that there are no incidents on the sets and all the lead actors were co-operative.
From what I’ve read, it’s because of the ending: “The film ends with Amit (Amitabh) and Shobha (Jaya) living happily in their marriage.” It’s the kind of public narrative Jaya likely wanted, one where she “wins” her husband in the end.
Rekha even referred to herself as “the other woman” in a 1978 Stardust interview: “People say the wife is always one-up because she has the man. I say the ‘other woman’ is ten-up because the man wants her in spite of having a wife.”
She also claimed she was deeply hurt by Amitabh’s decision not to work with her anymore, though much of her frustration seemed directed at Jaya instead. In the same interview, she said: “I looked at you, you turned your face away. Why? You feel you are badly off, but can’t you see my position is worse?… There is deep hurt in your gaze, but can’t you see that the wounds in my heart are deeper than your look?”
I bet the atmosphere on set was incredibly tense…
Damn, imagine fucking someone's husband, and then having them acknowledge it hurts you more than them. The hubris.