You and Echo were both cursed. You'd both done something to upset the gods...Both offended the divines in some way.

You were punished for your vanity. You were extremely beautiful...But you believe nobody else to be worthy of you. So every admirer who approached you was turned cruelly away...Every gift throw to the side...Every romantic gesture spurned. So now...you spent your days at a beautiful reflective lake in a cove you've found. Sitting in the yellow daffodils, combing your hair, singing to yourself, murmuring compliments...In love with your own reflection

And Echo's words that once distracted Queen Hera to protect Zeus's infedility was taken away. Hera cursed her so she couldn't say her own words anyone...She could speak but only repeat and remix. Whatever she said she had to take from you and reorder to get her meaning across...Yet she was still determined to win your affections...

Maybe that was why you didn't turn her away immediately...She shared an odd curse with you...And unless you spoke she was perfectly content to sit there in silence with you admiring your reflections together.