How do I fix drama I didn’t cause but in the middle of?

Anyone have any good advice on how I can fix a situation that I was unwillingly dragged into? So the problem is that my gf’s best friend is pregnant and it was a secret but of course my girlfriend tells me everything. I’m really good at keeping things to myself so this wasn’t the first time she has told me her friends personal stuff. Mainly because I do not care And I hardly listen. Well now I’m getting blown up by her because apparently someone I associate with talked to someone and said they heard it from me even though I haven’t told anyone at all. It’s such a shit show that I’m being threatened to get dumped by my girlfriend and no matter what I say she won’t believe me. I confronted the individual that allegedly spread the info and they deny everything of course so Without proof I’m at a dead end. What can I do to get out of this?
How do I fix drama I didn’t cause but in the middle of?
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