你已牵起她的手不再是我的
[nĭ yĭ qiān qĭ tā de shŏu bù zài shì wŏ de]
'You have taken her hand, no longer mine.' It represents the painful feelings of unrequited love after discovering that the crush/lover has been taken by someone else. The person uses this as a nickname possibly expressing a sad but realistic romantic situation.