Sean dated Hanna for part of season one, before breaking things off in Careful What U Wish 4 after he felt dissed because she was dancing with Lucas instead of him. Sean then briefly dated Paige before she realized that she was gay.
Spencer met Alex while playing tennis at the Rosewood Country Club, where he worked. The two made a gorgeous pair at the Homecoming dance, although Spencer's older sister Melissa did her best to sabotage things between the lovebirds. In the end, as ever, it was 'A' who ruined things permanently for Spalex.
Despite beginning this romance with the most awkward double date in history, Aria had a fling with our favorite Rosewood villain when things were on pause between her and Ezra. We've gotta admit, their musical duet in The Perfect Storm was seriously beautiful.
Ben was Emily's jock boyfriend when we first met her in Rosewood. Ben used to tease his girlfriend when she and Maya first got close. Thankfully Emily ended things with Ben after he tried to force himself on her in To Kill A Mocking Girl. Luckily, Toby Cavanaugh arrived just in time to push Ben away from her.
Lucas was like a love-sick puppy when he fell for Hanna while she was dating Sean. Despite being head over heels for Hanna, he still drove Caleb back to Rosewood as he knew that Caleb was the one who made Hanna happiest. Aaaawwww!
In a flashback scene, we saw that Spencer had previously enjoyed a flirtation with her older sister's now husband. Alison saw the two making out and gave Spencer a really hard time about it. In For Whom The Bell Tolls, Ian attempted to kill Spencer while her pregnant sister was in the hospital following a car accident.
Okay, we know that Aria and Caleb weren't a real romance as such but we still find it hilarious that Ella Montgomery was convinced that Aria was hooking up with Caleb when, in fact, she was sneaking around with English teacher Ezra.
When Alison saw Emily making eyes at Jenna in a flashback, she put two and two together and figured out that Emily was into girls. Thankfully Emily and Jenna never ended up dating. Probably a good thing as pretty much anyone who's ever been romantically involved with Jenna has ended up injured or dead!