man did u fuck up big time.. lol
try to get one of her friends to be in on it with u.. let her friend lead her somewhere she wouldnt expect u then have a picnic setup by a tree..
then have peter frampton sing "baby i love your way"..
lol jus playin.. but yea have a nice picnic somewhere, give her her favourite whatever (chocolate/flower/significant item etc..) then give her a sincere apology. kiss her on the forhead (chicks luh dat shit) and tell her happy 36 months instead of 3 years..
see where that goes and have some rubber ready
again i keed! but srlsy.. always be ready