Yep, happy birthday to you love, (sorry it's late, but go ahead and have a great day today too...)
Fact: you're not responsible for anybody's happiness but your own. None of us wanted to hurt our loved ones, but couldn't go on playing the games it took to keep them happy. Remember them? You have to live by your own conscience. They will make their own choices, and if that makes them unhappy, that's because they chose that way. You need to stop blaming yourself for things that they're doing to themselves.