After having an argument (but it was accusing me and another best friend of both doing something illegal) with my then best friend when I was 24, I'd never have 2 best friends again.
Basically, it can then all get caught up in lies, and deceit.
My issue, was, I was so angry with my best friend of accusing me of something that I told the other best friend she'd accused, partly because I thought she needed to know, but also as she had a young baby and was in a vulnerable position with an abusive boyfriend. I didn't want her to get in trouble and her baby taken into care.
Luckily the other best friend (with baby) was so incensed with first friend that she ended that friendship as did I. The other best friend ended it with me anyway.
Trouble is, in my scenario, was I never knew if the accuser was doing the illegal thing herself (benefit fraud) and doing it to 'get attention' or if the third best friend was lying to both of us and had actually did the fraud herself (the one with the baby).
I'm not speaking to either of them now, years on. I was best friends with the baby one though for years.
Sounds though in your case OP, you've deliberately shit stirred and it's come back to bite you in the bum. Hopefully one or both of them forgives you, but it's a hard lesson to learn. Do not do it again, shit stir but also if you do, don't lie and back track on it.
People appreciate honesty in friends, not two faced liars who betray them.