Is My Friend Lying??

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I should actually say ex friend because we've been fighting because he was insulting my Gf and he said that shes a whore because he Dm'd her on twitter asking if she'd blow a ginger like him and she replied "I've never had a ginger before". I suspected he was lying from the start so I'd ask her ex bestfriend because I'd figure that she might know her best and she told me that my gf is not a whore or a slut and would not cheat shes just desperate. And then last night I figured something out My Gf never followed My ex friend on twitter therefore making it impossible for him to Dm her and when I told him this he just tried to say she unfollowed him but I've been on her profile and it never said she followed him. She even asked my cousin if he knew who my ex friend was more proof that she doesn't know him. So is my ex friend lying??? And today I told him that his lie had me and he said "I'm not lying but did it"? and sometimes he would just change the subject