to treat somebody in an unfair and annoying way, especially by changing your mind a lot or not doing what you said you would
سر به سر گذاشتن, تعهد شکنی کردن, قول خلاف کردن, بازی کردن با احساسات, پیمان شکنی
I’m sorry to mess you about but there are a few last-minute changes.