If you don't know what you want, simply opt for generic birthday messages what I call "happy" birthday greetings on this site that "feel right" to you in other words, a message that fits your personality.
Another best seller in our adult birthday eCards category is our eCard.
The person you have forgotten about will laugh and immediately get rid of all the negative emotions that you could cause.
Happy Birthday my love.
Mainly because you are the grayest one here! Happy BIRTHDAY MY LOVE.
In fact, adding your personal touch will only improve what I've written, since you obviously know the recipient of your message better than I do.
I say forget about the past and live life to the fullest today.
Many many returns of the day.