Thats a tough question for alot of reasons. Without giving any kind of details, i guess you have to ask yourself if you think you did all (most) of the right things when taking charge over an animals life. If you feel your level of responsibility and competency was at par with care then id say you should get another. But...in my opinion, its not a good idea to get another to use as a crutch and ease the pain of death. Death is a fact of life, all animals are born to know this as self preservations, humans have to learn and understand this as they develope. A bearded dragon may just be an animal but when you go out of your way to name it, to give it your time, care for it, and play with it, they will eventually not be seen as "it" anymore and youll need time to accept your loss before moving on.