I don't know what really happened between Faith and Pac. I wasn't there, so I can't say if they did have relations or not. I don't really care about gossip like that with these rappers/singers. But I will say, even tho I doubt Faith knew Pac all that well (you can hang with someone that doesn't mean you know them that deep), I refuse to believe she didn't recognize anything about Pac. If you know what I mean.
He was one of the most recognizable names at that time besides Biggie and the all the popular NY rappers. Then again, Faith already said she was young and naive at that time. They all were to be honest (Faith was 21 when she met BIG and he was 24 when he died, and Pac was 25 when he died). So maybe she didn't know what she was doing. And what I mean by didn't know what she was doing, I'm referring to common sense. She didn't seem to have any in the younger years of her life, from reading her earlier pre-Biggie history in her book.