Rajveer had kidnapped Zoya once and left her to die in a water tank because she found out his plan to kill the Hoodas. He had challenged Aditya to find her without any clue.
Rajveer again today has trapped Zoya in a near death situation where if he goes through with it, it will be death of Zoya as a woman. Both times Zoya has landed up in this death situation because of Harsh Hooda. And both the times in order to protect the family she gets trapped.
According to the spoiler Aditya does end up running to save Zoya. I have faith he will reach to her in time like the last time he did. He didn't even know her whereabouts in the last water tank situation and still reached her. Aditya overcame his fear of driving to get to her. She was suffocating, drowning into the water but Adi reached at the last moment before she completely gave up. He went into the water with her to save her.
So today again Aditya will break out of all his fears and run to save the woman who has put her life in danger to save him. It may look like it will be too late for him to reach but he still will reach at nick of time before everything crumbles down and Zoya dies.
He had promised to protect her when he put sindoor on her head time and again. He had promised her silently when her mangalsutra fell and he caught it before it broke. So when he sees his love in this near death situation, he may feel he has failed all those promises he made to her and hence walks away.