I just did the worst thing ever

Around a year ago I had unprotected sex with a woman I met at a squat party. My friends said to get myself tested and we joked about it but I was especially worried because this woman seemed particularly seedy and looked like she lived rough. Well I got myself tested and I came up positive for HIV. My mother is a doctor and she's told me stories before of doctors making mistakes and whatnot and I guess I just managed to convince myself that they made a mistake and I just got on with my life in denial. Well, this is the bad thing. I've been in a serious relationship for around 4 months and we've had a pretty active sex life though we've always used protection. She comes from an aristocratic family and she is pretty conservative in a lot of ways. She rarely drinks, she doesn't smoke or do any drugs, in fact she never slept with anyone before me and now I feel terrible because last night we didn't use protection for the first time and I try to deny i t but deep down I know I've just given her HIV and I don't know what to say or do to make things better. I'm tempted to just never see her again, so when she does find out she has HIV I won't be there to see the dissapointment in her face but my conscience tortures me and I don't know what to do. So yeah, let me have it, I know I have done a stupid thing but how can I get out of this? I need to feel good about myself again and I can't see how

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