How should a girl feel when a guy......?

Ok ii knw dis grl who has feelings for a guy she likes and he isnt into her like she wants him too but when they are on teh fone talking he always bringin up "sex comments" and he ask her out and then when she asks him out he says "no" but he can tell his frnds and mii frnds dat theres nuthin goin on? What should she do bout this?