I'm not arguing or, I don't mean to seem argumentative with you, but in high school, people live in the same district.
In University, many come from different countries never mind towns. I myself would not expect a relationship with someone at Uni to be anything more than at most a 4/5 year fling simply becuase I have never had any desire to live anywhere else except my birth place and if dude didn't want to live anywhere else but his birthplace.. well, then it's at most a 4/5 year fling. Thats my point.
Op can certainly have a 4/5 year fling without him just after her for the sex. I suppose it depends on what she determins "just about sex" to mean to her.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion