Don't go by just one opinion (hey everyone! the guy needs feedback!)...but I like your idea of a letter...delivered with her favourite flowers?
I know, I know..pursuing, over the top...but from what you've written this IS her love language. And I sense you feeling that you've little left to lose.
What is the worst possible outcome from this gesture? She gets mad...too little too late...I believed this bull the last time (you'll HAVE to adress this!)...stop pursuing me!
Well...so what! You have a D on the table.
Especially if your letter were to not only spell out how much you DO love her, how you SEE that your neglect tore her apart...what you're willing to do/change to prove yourself...but it should also be No pressure...leave it open to a continued friendship, should that be her desire.
