Imagine how Lance felt. Sure he didn't show his emotions much, but his expressions of happiness were all faked: his laughs forced, his smile forced, and just his whole flirty, amusing, and happy aura faked. Imagine how he felt, knowing that Keith left, especially after the talk they had in season 3 about Lance 'stepping aside' because there was 'one palidan too many'. What if Lance blames himself for Keith leaving? What if he secretly cries at night in his room- or better yet, Keith's room, because he 1, misses him so much and he is scared for Keith's safety, and 2, he feels like he ruined everything. After all he is just the most useless out of all of them right? He was the one that should have left... Right?