When Clarke Sees Bellamy Kiss Echo 2.0 on "Exit Wounds"
In all four seasons of The 100, this is the first time we actually get to see Clarke observe Bellamy in a relationship. While she hasn't vocalized her feelings about it, it's very clear from her multiple reactions that she's not exactly thrilled. Everything in television is thought out and has a specific reason to be there. I don't know about you, but it seems to me that these shots are an example of that at its finest.
When Octavia Accuses Bellamy of Loving Clarke on "How We Get to Peace"
Obviously, this was our biggest tip-off about a romance between Bellamy and Clarke potentially happening. Clearly, Octavia does not hold back, and she outright stated that Echo wasn't the only "traitor" Bellamy loved. And by outright stated I mean outright stated. She left no room for questions or concerns. Now I don't want to say that Octavia knows best because she clearly has been making quite a few rash decisions this season, but judging from Bellamy's facial expression it seems like she hit the nail right on the head.
When the "Heart and the Head" Dynamic is Emphasized on "Shifting Sands"
The "heart and the head" has been a huge part of Bellamy and Clarke's dynamic since day 1. You can't live without both of them working together in unison. Clarke has always been the one to make the rational decisions and Bellamy has always let his heart run the show. Now that the roles are reversed, it makes us wonder if there's a reason for its continued emphasize. Is it possible that Bellamy's using his head because he left his heart on the ground 6 years ago? Only time will tell.