9 months downhill

Im 21 years old and have been in a 9 month relationship with my b/f.

Recently i have noticed we are sliding downhill.
He's hesitant to stay over sometimes
I find myself checking ph and emails incase his ex gets back into contact cause we had 3 months of hell with her
All emails from him now r one worded or just stamped with 'dunno'
I find myself ringing him cause he rings at 10 at nite or not at all
And im beginning to feel im not good enough for him.
I ask him for advice on friends on family or us and he says nothing he doesnt help me even when crying he just says 'stop crying'

He's all i have i have no friends just him would that affect him?