Even in the season 4 premiere, it was a quick moment but Octavia was clearly distressed when one of the Grounders had a sword to Bellamy's neck ... she looked pained when she thought that he was going to hug her before she went into the conclave (but he didn't), she asked for him right after she won the conclave and she demanded a spot for him in the bunker and didn't ask one for herself. Those are the few examples that I can think of, right off the bat.