
Right so to sum up, they both died unfairly so were sent back, but with no memory. But the prince killed himself in a past life, so he pursued her with that knowledge but that wasn't their fate. And even though he didn't remember anything the reason ML slept around was he wanted subconsciously protect her. So in his first life he married her and they were in love but they died unjustly probably because of the prince. In the second life he loved her and didn't sleep with anyone because of his love and that hurt her, in third life he slept around but still tried to protect her in other ways but couldn't save her. And now they are in their third life. The prince has to live out his fate and die as he should for this cycle to end. He remembers the past lives, all of them. Ines only remembers three of them. And Carcel is getting memories of all of them now. That's why the prince was always jealous of them, even when they had no contact, because he knew they loved each other in their first lives. If he would just butt out the cycle would end, he's the one who keeps it going by not accepting his fate. I think it's likely that the prince caused their deaths in that first life because of his obsession with her.