Still have feelings for ex?

Only you know what's best for you. He's your ex for a reason right? I always say it's much more depressing to watch the life you never had p before your eyes. Human nature is that you want what you can't have. Also, I'm sure the old one knows you a lot better than the new one (for now) and that is what is comfortable to you right now. It's normal. Stick with the new one.