My bf has been hospitilized with paranoid schizophrenia

Ok so here s the story: I was with my bf of 4 years (now my ex) when i met this guy, we started meeting up ect ect and he was amazing iv never felt like this about anyone i fell in love with him within the first week we were seeing eachother. I finished with my bf and we got together as a proper couple on the 1st of september. I had been renting a house with my bf and obviously had to move out so the new bloke said come move in with me which is what i did. On the 20th september he i dunno how to describe it or what its called so just gonna say he had a breakdown due to stress to do with access to his son (he had told me about his condition from the beginning but we had nt really talked about it as it had subsided (he has medication but it was only stuff he had to take as and when he thought he needed to)) anyway luckily his mum and her bf live next door because he locked me in and they heard him shouting so they called the police and ambulance he ended up going to police station to calm down and was then moved to hospital. We went to see him and to start with he would nt even talk to us. Then he started talking to us and was making a genral improvment then he was back to himself with in about 3 weeks and i was thinking yes he s gonna be home soon he was ringing all the time and having half hour conversations with me and everything was brilliant id get lots of hugs and kisses when going to see him. But then a couple of days later i got a phone call and he was finishing with me i know he does nt mean it but it does nt make it any easier. Anyway after that he got a bit better and we went to see him again he was very distant and when we left i gave him a big hug and told him i loved him and carried on hugging him he did nt say anything then just as i was about to let go he said i love you to. Since then iv heard nothing i try and ring he wont talk to me we ring the nurse to see if he wants us to visit and he says no. Why is he pushing me away? He s been in there a month this sunday and i miss him so much. Iv been writing him a letter everyday i used to take them in when we visit but i think im gonna have to start posting them now. Just some advice on how to deal with this and what to say to him ect would be great iv never dealt with anything like this before. One thing i do know is i love him and im gonna be here for him know matter what. Im also wondering how long he s going to be in hospital as well?