If you're kicked out of rehab what are the chances of jail time?:
Get a new boyfriend.  He seems to not be able to change or want to change.  Driving on a suspended driver's license is a serious misdemeanor.  He can't seem to follow the simple rules to get him out of trouble.  He was sent to rehab to give him another chance and he messes it up.  Simultaneously he gets caught driving on a suspended license.  If they find out about the driving violation and being kicked out of rehab, he may face some jail time.

I highly suggest you separate from him, it is going downhill fast.  I know you are dedicated to him, but give that dedication to someone who has a chance at doing something instead of doing time.  Just get out of his way or you will be joining him.