My boyfriend was serving 2 years probation but was arrested again what will happen to him now?

He will be tried for his new crime and sent to jail/prison to serve out his original sentence plus the new one. **They can put him in jail AND charge him for the first reason he was arrested for. Depending on why he is arrested for this time. They put him on probation, this means that they trust him not to get into trouble again. If he does, they can revoke his probation and keep him in jail. They also can just charge him with violation of probation and keep him for a few days or weeks in jail for that then release him again on probation depending on what he did to get arrested for this last time.