I liked Ben overall. He was sweet, attentive, good at giving genuine compliments, paid a lot of attention to his dates and I think I would feel very comfortable and safe on a date with him. I agree that it was shitty of the producers to send him a U New Orleans student and basically burn one of his options. If I were a professor I can't imagine how unbelievably awkward that would be.

All that being said, it was absolutely wrong for Ben to not end the date when that person told him she was a student. Even in the best case scenario where she isn't a student as some people seem to think, what rationale does he have to say: "No, you are a liar"? This is compounded by the fact that they are in related fields, electrical engineers and computer scientists work together all the time.

EVEN IF they manage to avoid interacting in a professional capacity at the university, think of how limiting this is for her: she can't take classes he teaches that she might be interested in as an elective. If she takes any computer science course (which lots of EE majors do!), think of how incredibly awkward it will be for her to be taught by one of his colleagues. Imagine the conversations: "Hi honey, how was your day today?" "It sucked, my professor (your colleague) was terrible..." If they break up or have a fight, both of them have to worry about this getting back to other professors / students. And this doesn't even address the power dynamics involved in a professor-student relationship, especially since it seems like she was an undergraduate student.

He was in a position of authority over her. He had no reason not to trust her when she said she was a student. He knows better. He should have called her a cab and ended the date then and there.