In my vision, JasFa would be toxic in any condition. Both were selfish immature people who were used to lean on others. Once their crutches, esp Tejo was removed, they'd have been that couple which fights at 2-3 am shamelessly, or amidst a restaurant.
However the other is much darker, I've believed that F was in love with tejo from the beginning. Now if jasfa had gotten married as planned, and time had passed, F would have realised this and he'd have gotten darker in order to get closer to T. T, would have been again an innocent bali ka bakra unaware of his intentions.
In show's story, F wouldnt have toned down. Once he realised just what kinda manipulations J did, and it ultimately led to Tejo going away, he'd have thrown his whole life in making her suffer for making T go away. He'd be much much worse, this would be the darkest one. There could be such a dark web series on this
are real life is way different. Honestly 50 shades etc have done much harm, people barely know what bdsm is and it gets awful, mostly for women. 90% men screaming what a dom they are, they just want to abuse women and get away. One gotta be very very careful. It requires immense patience, respect and trust. (and that's where the thrill is, to have someone you can trust so much, is exhilarating in itself)