I think Felicity would've been happier married to Arthur!
I know Gus and Felicity were a cute couple as young teenagers, but as Felicity became an adult I think she grew away from Gus. Meanwhile Arthur matured more in the later seasons. It seemed as if he became a perfect match for Felicity. Gus laughed at Felicity's dreams and left her to sail off somewhere. Arthur had always been supportive of women pursuing their own goals(both with Sara and Felcity). He became a doctor himself. He had much more in common with her. Felicity said she wanted more than ironing Gus' socks. With Arthur, she could've married him and gone on to medical school with his support. Gus didn't seem to want to stand for such a thing.
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