Should i stay with my wife after she cheated and now may have given me aids?

I am 26 and have been married to my wife for a year we have a 2 year old son and well she cheated about a month ago and she got aids from the guy but didn't bother telling me and now i am waiting for my tests to come back to find out if i have aids now and i am just dealing with a lot because she still hasn't given me a reason as to why she cheated on me and i have just been so broken hearted and we haven't been sleeping in the same bed or anything and i just can't even look at her without getting teary eyed and it just hurts so much my big sister keeps telling me to leave her and just divorce her and that i deserve better. But if i have aids because of me who would even want me =/. Just unsure what to do, Advice?