Responses
Spoiler alert
Actually, in the novel, he doesn't believe her. He thinks there's a deeper reason that she's not telling. He starts pursuing her again (like when Kyle wanted to marry).
At the same time, Mathias blackmails Leyla to rape her. Kyle sees them and when confrontring Leyla, she tells Kyle that she loves Mathias and that's when Kyle stops pursuing Leyla and goes to university.
There author wants to "camuflage" the raping as "not knowing that it was love" saying that eventhough Leyla hated Mathias, Kyle felt that the way she said "I love him" was certain
I think she's so ridiculous for expecting Kyle to believe that lie.
After all those years together, she still doesn't realize how much he knows her.
If he does believe it, it'll just be bad writing for real