help me

So I need some help, yesterday at 14.15 my partner was arrested I didn't know why and no one could tell me anything, we have a 3 week old son together.
Well his been speaking to girls on an app and one of them was 15. At first he didn't mention the other 15 girls he had been speaking to(they were all adults) 
I'm absolutely devastated, we live with my mum and dad and social services have to get involved because of our son(I trust him 10000% with him) 
I just don't know what to do or think, he knew at the time I was pregnant and in July he proposed to me, all this apparently happened in February.
I don't need you all to judge, I just need some support and for someone to tell me I'm not crazy for wanting to stay with him, he is my life and is everything to me and even after everything I couldn't imagine life without him, we find out in January the outcome( it will probably a prison sentence).
I'm just hoping this is one big nightmare.😭😭😭