Help!! Don’t know who to believe!!

So there has been a TON of drama circling around my school lately and most

of it revolving around this girl we will call K. So K is only in 9th grade and I’m in 11th but since I go to a very small home school like group (only 20 kids) we all interact with each other no matter the age/ grade. So everyone is beginning to dislike K because they’ve realized she’s telling everyone peoples business and very personal things that these people have told her not to tell. I realized this a long time ago so I’m not really in on the drama but today, her ex- friend who we will call J, told me K was saying my boyfriend of over a year had sent her nudes and told her he liked her. I really wasn’t sure as to why K would say that because she was talking to a guy before he knew about her spilling all of his personal business to everyone within the school and was seemingly uninterested in my boyfriend. Also, I am 99.9% sure my bf would never send nudes to another girl nor tell her of all people he liked her. What I’m confused about though, is that when I asked K about it she said she never said that so if she was trying to break us up or something she would have fully committed to saying that had happened. So idk whether to believe that J lies just to create more drama and so that more people dislike K, or if K really said that about my boyfriend? Help!!!

this is what she said when I asked her about it