I think she was attracted to him physically/sexually and enjoyed the sex, but agree that she was using him to fill her "ex void." I do believe the reason she didn't "like" him is because she can't like him, or anyone, since she is still in love with her ex. She will literally "like" nobody until she gets over her ex. She'll compare every guy to him, and when they don't match up (because nobody can), she'll dump them just the same as OP.She is not using him for sex. She is using him to fill a void, for validation, for company to avoid loneliness. She didn’t like him. For someone who says “learn more, talk less” you sure talk a lot. You literally don’t know what you’re even talking about. All your concepts are waay off.
I don't even think he "turned her off." I just think she realized he wasn't her ex. Also, her period and being "emotional" on the last time they hungout might've moved that decision along.