It means no.
It means he is interested in you but doesn't want give it away just yet.
Whatever you said to him to make him feel flattered does not need a reply or, you could say 'You are welcome.'
If a guy says he is flattered when you tell him you like him, it typically means that he appreciates the sentiment and the compliment, but may not feel the same way romantically. He is acknowledging your feelings in a polite and respectful manner without reciprocating them. It's important to respect his response and communicate openly about your expectations moving forward.
There's a possibility that he was really flattered and saw your comment as a hint that maybe you like him too
Men like compliments, they love the confidence that comes with it.
She is probably flattered.
That they think u are cute!
She loves you and is flattered by your compliment
This guy sounds like a keeper! He could mean that he regards you highly, may even love you, finds you so beautiful and thus you flatter him by being with him. It could also mean that you have treated him with respect and encouraged him when he needed it and you bring the best out in him.
Je suis flatté means 'I am flattered' in French.
She's really flattered...that or she's flirting.