911! please help

Long story short I feel asleep at my ex step brothers house I was high n apparently he claims to rub his dick on my vagina. And now he's saying he thinks he has something n is talking to me crazy. My last intimate time was may 11. And we used protection but we have gone without before. My ex step bro says he got tested may 6 n that everything was clear. The day I was over there was may 13. He said for the past few days he's been itching n that today he started burning and is getting tested rn. I have no knowledge of me having anything let alone any of my partners. And shouldn't my partners have it to if he does if it came from me. Like if I had it n gave him something that mean I either gave my past it to or they gave it to me but haven't said anything