The episode (which doubled as the 100th episode special) ended with Oliver letting go of his guilt over everything that has happened over the course of the last decade.
This seems to echo the emotional resonance of the four-way Invasion crossover that took place last year.
Based on Wendy Mericle’s comments to TV Guide about this crossover, it sounds like this crossover could provide a similar catharsis for his future with regards to how he evolves in his search for love.
During the Arrow portion of the recent crossover event, we watched Oliver deal with the grief of his lost family and friends who had perished ever since the death of his father when the Queen’s Gambit sank in 2007.