My ex's birthday is in October and I've been thinking about that...I think I'm going to do it because it's a nice thing to do even if they did dump you...Kind of just being the bigger person. I also think she'll be quite surprised I even took the time out of my day to remember her birthday which most people don't...haha
Also note this: A reconciliation happened with my friend because of a mere birthday wish. He hadn't spoken or seen her in 6 months, deleted all her accounts it was strict silence. He decided he was going to just send her a nice birthday message. Nothing to big just a nice sincere happy birthday. They started talking over it and now they're back together!