Douchebag Billionaire play-boy, pre-island Oliver Queen (Stephen Amell) cheated on his current girlfriend, Laurel Lance (Katie Cassidy), with her younger sister, Sara Lance (Caity Lotz). Three seasons have seen Oliver bounce between Laurel and Sara (and many other supporting characters) to apparently settle down with Felicity Smoak (Emily Bett Rickards). However, season 4 will look to address the season one love-triangle to put it to rest once and for all, as Sara moves to DC's Legends of Tomorrow.
Arrow executive producer Wendy Mericl told TV Guide, "[Laurel's] journey this year is tied a lot to her sister. We're excited because the series started with the whole triangle of Oliver and Sara and Laurel. And with Sara coming back and then moving on to go on her own journey, we have the potential to change the dynamic there in a really positive way for Laurel. [We] kind of put the past to rest."
In seasons past, Arrow showrunners have stated that Oliver was destined to end up with Laurel by series end as Black Canary and Green Arrow are husband and wife in the comics. However, the fandom fervor for Olicity seems to have changed that plan. Given the current dynamics on the show, it's hard to imagine that Oliver will ever end up with Laurel. Unless something happens to Felicity.....