Listen to SGB, please please please.
I have been in your shoes. My ex didn't speak to his family, he had no friends, and was snide about his work colleagues and his exes were "messed in the head".
I was his saviour, the only thing that kept him going. But he could sulk like you wouldn't believe if I "wronged" him or didn't take his side if he'd had an argument with someone. It was always the other party's fault. Be it road rage, supermarket rage, work spats, quarrels with his neighbours about parking, everything.
He wore me down very gradually and almost without me noticing. I found myself always backing down, he wouldn't contact me for days if we rowed, I always seemed to make the first move. He refused to seek help, I was at fault for making him feel down and not being supportive. I tried to help him for so long, but it sucked the essence out of me.
I, like you, thought he was my world. It wasn't until I left that I realised he wasn't. You shouldn't have to ask for his support. It should be there unconditionally. Wait for him to call you, at very least.
You'll be fine on Monday, stay strong and if you have a wobble, come on here.