凯子你爱谁马子你选谁
[kăi zi nĭ ài shéi mă zi nĭ xuăn shéi]
This nickname uses Chinese slang where '凯子' (kai zi) means someone who is easily deceived and '马子' (ma zi) refers to a lover or mistress in a derogatory way. It implies that if one can't decide on love and partners, they are easily manipulated by others.