When HIV is left untreated, it can lead to AIDS which is the final stage of the infection. However, HIV can be treated with vigorous medication and can be controlled from spreading to your partners. It is also preventable with the use of pre-exposure prophylaxis (PrEP) and post-exposure prophylaxis (PEP).
People with HIV live long and healthy lives if they get on treatment and practice safe sex!
Sources:
https://www.nhs.uk/conditions/hiv-and-aids/
https://www.hiv.gov/hiv-basics/overview/about-hiv-and-aids/what-are-hiv-and-aids
https://www.hiv.gov/hiv-basics/overview/about-hiv-and-aids/symptoms-of-hiv
https://medlineplus.gov/hivaids.html
https://www.mayoclinic.org/diseases-conditions/hiv-aids/symptoms-causes/syc-20373524