I slept with a guy my friend slept with and now she’s mad at me?

. My friend hooked up with this guy 6 months ago and she said it was boring and she wouldn’t go there again and that she was bored and she’s not talking to someone else. I got with him on a drunken night like 1 month ago and she just found out now. She said she dosent trust me with boys at all so she dosent wanna be my friend and blocked me on everything. Is it that big big big of a deal? I mean they don’t talk in a sexual way anymore, they don’t like each other so I think when I was drunk I just thought What’s the big deal? Or am I being not very empathetic here. When a friend tells me they don’t care about the person and it was just funny and fun and they were drunk I just thought they would be ok with it? I’ve had loads of friends do this to me and me not care since they were just a bit of fun anyways? we’re all 19 and it’s the fact she’s turned every one of her friends against me and my friends are also her friends since I met them all through her. I do have others friends.
I slept with a guy my friend slept with and now she’s mad at me?
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