What happens if you're arrested while on probation?

Today my boyfriend was arrested for driving with a suspended license. He's on probation for larceny (I think)... or something along those lines. The guy at the jail told me he'll have to stay at least 10 to 14 days without bond. Is that true? Because he's the only source of income for us and our daughter. How can they deny him bond? Does anyone know about this sort of thing?