他深知他心仍得她心她孰知她心必得他心
[tā shēn zhī tā xīn réng dé tā xīn tā shú zhī tā xīn bì dé tā xīn]
It means 'He deeply knows he must win her heart and she also understands she must get his.' Reflecting complex interpersonal dynamics or mutual understandings of emotional expectations within a potential romantic relationship.