Odd question, I know. Story takes place in 1988. Guy needs to be a "cool" or "jock" dude, and girl, a popular girl. But looking for a couple that only nerds would probably reference. Can't say Tom Cruise and Kathy McGillis, for example.
Hmm, probably a geek. And probably scifi. I was thinking the actors that played Lister and his love interest on Red Dwarf?
How about the Nick / Pamela / Scott love triangle from Teen Wolf? Nick's a Jock. https://80smovieguide.com/teen-wolf/
"Ferris Bueller's Day Off": Ferris and Sloane. "Say Anything": Lloyd Dobler and Diane Court. It doesn't get any better than that D'oh! You meant Sci-fi? Han and Leia. Dave Lister and Kristine Kochanski
I guess Data and Tasha Yar (Star Trek Next Generation - '87) ... if I remember correctly, they were romantically involved, be it for a very short time.