Oh, it was awkward but I think it was meant to be? Sterling’s previous and current love interests talking, except only one of them actually knows! And is freaked as HELL about the other even suspecting.
I’m not sure why those things have to be mutually exclusive, that she was telling Luke to move on because it was, well, true, and better for all three of them if he did, but also feeling bad–not at them breaking up, that happened before her, but I think at the subterfuge and listening to him talk to her as a friend about Sterling and his hopes of getting back with her while she’s secretly hoping for the opposite. I think that final “I get it” and then turning away in frustration was because, what can she really say that doesn’t seem two-faced and manipulative?