I know I'm a good girlfriend I just hope this time he change is there any suggestions on how I can help him change when he get out

He has to want to change. You are not the problem. If you think that you are going to change him, you are wrong. He has now been in the system which makes it easy to get caught up in something else (because they are now watching him more closely) and the future is going to be tougher than before this charge. If you see that he is willing to cut off all ties to his old friends and stop going where he used to go, this is a good start to the road of never going back, If you see that he is doing the same things, we would advise you to run, and run fast.