I have been in this position many times with my oldest AS, I don't know where you live but in my state they have to have a hearing within 72 hours, and they can request an attorney at that time... I like the idea of sending your love with his girlfriend.
In my case I always felt better when my son was locked up because I knew that at least for that night he was safe and I knew on the streets he wasn't.
I wish you strength and wisdom in whatever you decide.