Booking a holiday sounds like a great idea. Why don't you just do it, Dilly? You might still be sad, but you can be sad somewhere warm and while sipping a brightly coloured drink. Your H might remember, he might not. He might remember and feel too awkward or selfish or hungover or busy to cherish you as you deserve. I know cherishing yourself isn't the same, but I think booking a holiday over those two dates is a brilliant idea. Also - tell all your friends it is your birthday and you're going to be away so you get nice texts on the day itself.