Nas is the GOAT, but i believe her but only to a degree. I do think she is embellishing. Bringing up the Rhianna incident creates an image that i dont think fits her story.
saying she had bruises on her body is different from having bruises on her face, you can get bruises on your body from anything. Ive had chicks attack me and i would grab their arms to stop them and they got bruises on their arms. Sometimes the only way to stop a chick is to hold her still and if she wildin she can end up bruised. It seems like she is using an incident where she says she had bruises to paint him as an abuser but thats not necessarily the case.
Also she says she isnt afraid to throw a punch, which is basically admitting she would punch him. Meanwhile she doesnt say he punched her. She does says he "hit" her , but he could have slapped her legs and she could still say the same thing but the image she is painting comes across a certain way.
And saying he would drink alot and wont rememeber is a convenient way to get away with saying anything because "hey, he doesnt remember", so of course he cant defend himself. and she tries to say she is a private person and that he loves the accolades when he is notoriously prives aswell just goes further to suggest she is skewing her story
So yeah i dont think she is making it up entirely, they probably had a volatile relationship and it probably got a little rough at times but the image she is painting of him being a drunk violent abuser seems to be a bit of a slant. She never says he beat her or her hit her face or he hurt her or that she was scared of him but she leaves all that open for speculation. By keeping it vague she lets peoples imagination run with it.