deceive yourself

خود را گول زدن
Human beings have an infinite capacity for self - deception.
انسان ها ظرفیت بیش از حدی برای گول زدن خودشان دارند.

to refuse to accept the truth
امتناع کردن از پذیرش حقیقت
She thinks he'll come back, but she's deceiving herself.
Her main character flaw is her readiness to deceive herself.
He insists that she loves him, but really, he's deceiving himself.