Basically Cyborg has romantic options. Just pick the one you're most interested in exploring.
Reading List (Super behind but reading them nonetheless):
DC: Currently figuring that out
Marvel: Read above
Image: Killadelphia, Nightmare Blog
Other: The Antagonist, Something is Killing the Children, Avatar: TLAB
Manga: My Hero Academia, MHA: Vigilanties, Soul Eater: the Perfect Edition, Berserk, Hunter X Hunter, Witch Hat Atelier, Kaiju No. 8
cyborg and bumblebee never had any flirting moments. they have some bickering and she made mention about cyborg's crush on jinx when he went undercover in the hive academy. sarasim and jinx was pretty much his only romantic interest. he had more flirting/affection moments with starfire than bumblebee