“I think he (Steve) teaches her (Diana) about the complexities of mankind, that she doesn’t understand in the beginning, and I think that she reminds him of love, and hope, and good things.” 

Honestly Raven and Bell’s feelings at this point are very much up to personal interpretation so I do kinda see where you’re coming from however I definitely disagree.

Fist off braven’s relationship has nothing to do with the fact that they slept together because being in love ≠ having sex. I mean has it contributed to both their characters’ development? Sure. Does it define their relationship? Nope. Braven has undoubtedly one of the most amazing developments on this show, they went from quite literally wanting to murder each other to having created a support system with one another. It’s very clear along the course of s2 that bellamy has feelings for raven that go beyond the protective instincts he harbours for all the other delinquents.

Becho

Braven/Rellamy

Clexa

Flarke

Their ship names don’t combine their names equally like Bellarke does.

Becho (Bellamy + ECHO)

Braven/Rellamy (Bellamy + RAVEN/Raven + bELLAMY)

Clexa (Clarke + LEXA)

Flarke (Finn + cLARKE)

But Bellarke does share equal characters in their ship name.

Bellarke (BELLamy + clARKE)