My girlfriend and I arent going well anymore?

right well a couple of months ago me and this girl kept flirting like alot then she went out with my frend and now theyve broken up and she said she liked me and yeah now were going out (i REALLY like her) but were just not talking i say hey she says hi i say g2g bye love you xxoo and stuff she says bye ily -.- kinda annoys me if shes being like that whys she still with me? is she gonna dump me? shud i dump her? will things get better? PLEASE HELPPPP