Scared

I have this boy I was recently sleeping with last month just tell me today he think he has a std so I’m scared like shit , yet he told me the end of March he had a threesome with this two girls and after the threesome he experienced the symptoms and he just telling me this after we had sex yesterday I used a condom but yet for some reason he refused to pull the condom all the way up n today he refused to take me to the emergency room he kept say why you got go there why . Yet he went to the doctors this morning. I feel like he knows he had a std but trying blame others or am I losing my mind I’m going to the emergency myself .