I feel like right now Rosaline is still so caught up in her past with Escalus that it wouldn't make much sense for her to be jealous so early on. This is why I can't exactly see how so much can come to fruition with only 7 episode this season maybe series. It would feel quite rushed.
Ben is a man in denial, he will deny till he's blue in the face
Unless Rosalines personality changes in the next few eps I can't see her saying "you have me" to benvolio if she was to say anything it would be much more guarded and evasive than that.. more like "you're not alone" lol