对不起我不配做你男朋友
[duì bù qĭ wŏ bù pèi zuò nĭ nán péng yŏu]
"Sorry, I don't deserve to be your boyfriend." Showing deep regret for feeling unworthy of having a romantic relationship with the one they care about. It reflects self-blame or self-deprecation by admitting he's inadequate to match someone as a lover.