Honestly my favorite line of the whole episode was Bellamy’s “I’ve got you for that”
It was so soft and heartfelt. There wasn’t a single scenario where Bellamy felt that he was going into space without Clarke. He was saying “don’t even mention it because it’s not going to happen”. That two parts make a whole. Until he had to leave her behind and take on both parts. Now they both wait until the day when they can reunite with their other half.