1.) if she would be that close to ur friend while she has a bf, chances are, shes got commitment issues..
2.) shes prolly just gettin bored with her bf and wants to have a lil fun by leading ur boy on.
3.) she might be doubting her current relationship and is really into "joe" ..
4.) in the end, only "joe" will know how sincere she is..
i dont know y i did that in point form lol but gj to u for lookin out.. id tell my friend to watch out and play it back a lil until they officially bring things up abt their "relationship"