Lae'la only wants what's best for Santana. She knows that she isn't good for Santana, and she needs Santana to know that. She needs to push Santana to follow her dreams, even if it means pushing her away from herself. It'll kill her inside, but it's what's best for Santana. That's what love is right? Sacrificing your happiness for your significant other's. Santana is her happiness, but she can't hold Santana back. Santana doesn't understand, that it's what's best for her.