Any thoughts ?

Alright so my ex came texted me saying he misses me and wanted to be in a relationship I kept telling him no and that I was in a new relationship and yet he kept telling me he loved me and called me baby. Last time he texted me was May 12th. His girlfriend texted me today saying " I've seen messages between you and ..... I just wanted to let you know not to entertain this boy we've been in a relationship for two years . " like wtf? If she saw the messages she would realize I don't even want him like wtf. I wanna repsond back but I don't even know what to say .. my one friend said she feels like the girl wasn't being bitchy she just wanted to inform me about them being together ..