Why won't my boyfriend talk about his ex?

We've been together almost a year, and he will not tell me about his ex - her name, how long they were together, why they broke up, he has NO pictures of her on his FB and no posts (he said he deleted them all after the break up).

I want to know about his past and his refusal to tell me about her just makes me want to know more, I've tried asking his Mum but she said I would have to ask him, and his friends tell me they've been told not to tell anyone, it's really pissing me off, what can I do?

Why won't my boyfriend talk about his ex?
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