am i wrong for being upset over this??

the guy i had vented abt before came back to me, we were doing really good these last 12 almost 14 days (two weeks) n js today he told me that 4 days ago he accidentally kissed his new female friend. so i had asked him if he could stop being friends with her, bc accidental or not it’s still a kiss?? u shouldn’t stay friends with someone that u kissed while ur dating someone. idk if that’s wrong to think bc he said it was an accident. he told me im being dramatic n he’s not gonna get rid of a good friend he made, that im being stupid for wanting her gone n “i dont wanna see him happy” bc apparently me not wanting him to be friends with ONE person bc they kissed by accident is me not wanting him to have any friends at all. i feel like im spiraling n i haven’t stopped crying over it. i love him so much. i don’t even care abt the kiss anymore i js dont wanna feel crazy for wanting them to stop being friends bc i dont wanna end up losing him to yet ANOTHER person. what if he leaves me for her man. i’m js scared. js idk what to do.