HIV symptoms but. Me if she is infected?

Hi doctor, i had a risky exposure with a female sex worker on jan 18th. I did a protected vaginal sex. a week and half later i got diarrhea for 5 days and fever for a week. a month later, there are 4 cold sores appearing inside my mouth. 2 months after the risky exposure i went to get tested and it came out negative. Now i only have sore muscles because i think i got to tired doing exercised. when i had cold sores (after finding out im negative), i kiss my girlfriend in the lips for quite a long time, but my cold sores were healing and i couldnt feel any pain if they were touched. a week after kissing her, she got a day of diarrhea for only 1 time in the bathroom. Now she's having sore throat, a pretty bad one. Can you tell me if she is infected? But my test came out negative at 2 months mark. please help me.. Thanks