[ elena thinks about it too. she's thought about it, been told about it, talked about it, lost sleep over it, cried about it. argued about it. she knows what damon did to caroline.
she knows why bonnie wouldn't want that to happen to her; she can't and won't deny the kind of person damon is. she's talked about it so much with caroline... (damon's hurt her. he's pushed her away, done awful things... but she knows the one thing that'll always be hers is her will, her desires, her actions, her thoughts.
it doesn't make up for anything or make it okay, but it is the truth.)
she's looked away, to the side, thinking about all this. it's only when bonnie says they're human, that they can be selfish, that her gaze finds bonnie again.
she might not understand, she might be worried and think it's a horrible choice, but she's still here. she still accept and loves her. elena tries to smile some against the prick of tears in her eyes. she takes bonnie's hand, squeezes it. ] I love you, Bonnie. I'm sorry I didn't tell you before now.