I agree with SGB and also question why the police have told you to check into a hotel in the early hours with all of the disruption this will cause to your ds and yourself, to say nothing of the cost of hotel accomodation which, presumably, the police have not offered to pay.
If your, hopefully now ex, bf has been arrested it's possible he's being held in custody and won't be released until some later today. If he's not charged tonight/this morning, the police can release him on bail pending further investigation into the incident and can impose conditions prohibiting him from returning to your home and/or contacting you in any way including through a third party.
Before you embark on what may be a needlessly costly excercise, I suggest you call the police station and ask whether he's still in custody and, if not, whether he's been released on police bail and, if so, whether conditions have been imposed.
I would suggest that you gather all of the essentials & documents together and leave them where they can be easily accessed in the event that you have to leave tonight/this a.m, and then make yourself a cuppa and settle down for what may be a restless night it it transpires that he's on the loose.
As SGB has said, if he returns to your home simply call 999 and the police should, at the very least, tell him to stay away.