What should my friend do in this situation

My friend has a problem with this girl that wants to have a relationship with him but he’s not ready for a relationship. He met this girl from a mutual friend and they were a little bit flirty and this girl took it a little bit to far when she started sharing more personal information about her life and stuff (they have been only talking for a week). She already has him as her phone and lock screen and she always wants him to text her goodnight beautiful( only after a week!!). She is moving soon and he hasn’t actually met her in person and he wants to just be friends with her. The other night he was talking to her and mentioned tough love or something and she took it the wrong way and thought that he was saying that he loved her. Now he has no balls to tell her the truth because he doesn’t want to hurt her feelings. Do you guys have any suggestions on how he can fix this situation.