Nosy friends

Hey guys, so my friend group in school is like 5 close enough friends with little best friend couples basically like it’s 3 couples of best friends. I’m currently seeing a boy that I’ve to keep secret only because of our parents ,which means I keep it from my friends because I know they only talk to me to talk about me and my secret would spread. Recently one of the girls started getting suspicious and she asked a girl she’s friends with about the lad I’m with (she only knew his name cause I mentioned it before we got serious I know I’m an idiot) then she started asking me u sure it’s over and all this. Then last night that girls best friend told me they found out because she had an old phone with the oldSnapchat where you can see whose in people private story and he was the only boy. After telling her no I’m with a different boy she accepted that at first but by the end of the night she was really mad at me. She spent the night with a few of my other friends and while there texted me r u done with him and I said yes and she just kept saying hmm so they were obviously discussing MY BUSINESS together. I really don’t know what to do at the end of the day it’s my life and I probs won’t even be friends with those girls wen I leave school and I really really love this boy