I'm so proud of you! Sounds like you had a wonderfully friendly attitude on the phone.. and the conversation lasted much longer than I initially thought when he said that he was busy practicing before the 9pm curfew.
I think the conversation sounded great!! It is totally a plus that he is planning on calling you now.. you did a wonderful job of leaving the ball in his court!!! And the fact that he opened up about how he is resolving issues with his roommate.. and that they had been making him miserable... nice that he recognizes there were/are other stresses in his life and that there are ways to work through them.
You sound so cheerful.. so loving.. how could anyone NOT want to talk to you!! You are building a bridge of friendship!!!!!!
