If I wanted to express my undying love to someone, I would quote to her the beautiful woman proposal from Barchester Towers by Anthony Trollope, with my beloved's name in place of Eleanor's:
'Beautiful woman, you cannot pretend to be ignorant that I adore you. Yes, Nono, yes, I love you. I love you with the truest affection which man can bear to woman. Next to my hopes of heaven are my hopes of possessing you. How sweet to walk to heaven with you by my side, with you for my guide, mutual guides. Say, Nono, dearest Nono, shall we walk that sweet path together? Ah! Nono, will it not be sweet, with the Lord's assistance, to travel hand in hand through this mortal valley which his mercies will make pleasant to us, till hereafter we shall dwell together at the foot of his throne?'
I wish you the happiest of birthdays, my lovely waifu Nono.