Worried...

Hi. Today I was really down about my break up with this guy so I talked to my cousin's girlfriend (who is a social worker) and I told her him and I had sex (I'm fifteen and he's seventeen) and she told me she is going to report him. I really regret telling her and if she does report him I'm worried what it'll do to his career in the police. Please help. Btw I'm from the UK so obviously sex under 16 isn't legal...