keep worring about hiv

Lu

i last got tested in april 2017 and everything came back neg (i have herpes though) i have been seeing a guy friend for about 2 years and he got tested in july and again everything came back negative we haven't had condomless sex since. we always use condoms now but a few months ago we didn't always (i was on the pill.) i still worry about hiv being present in one of us though i have bad anxiety :S how can i stop this worry?