你若是梦便不要让我
[nĭ ruò shì mèng biàn bù yào ràng wŏ]
This could be translated as 'If you are just a dream, then don’t let me...'. It seems to reflect a wish that if something/someone feels unreal or elusive, then it should avoid causing emotional attachment. Perhaps the speaker does not want their hopes raised if there is a risk of disappointment.