What should this girl say?

Alright so my friend had this guy that shes been hooking up with for a couple weeks and they talk everyday. What would be a subtle way for her to talk to him about his feelings for her? like how would she figure out if he wants to date her. she wants him to say something first but he hasnt said anything. he has left hints and stuff but not too much. and he told our friends that he sees her as girlfriend material but she wants to hear it from him.