Any suggestions?

Basically. I still love my ex.
We don't live near each other.
But we went out for a year and did fine.
We saw each other at least every weekend.
And i loved it.
But i was a stupid little girl then.
I didn't know what i had.
And now that i've lost him.
I want him back.
I just don't know how to get through to him.
Coz I know that he still loves me.
He just doesn't believe i'm not that stupid little girl anymore.
Any suggestions?

Well try to prove it by acting way mature around him and your friends can kind of give him hints noting how much you have matured. Not exactly to him just when he is listening or overhearing.