Apparently I hit my best friend while drunk and I am so stressed out and ashamed of myself (will award MHO, bit long, sorry)?

Anonymous
I went out last night and apparently I was being horrible to my best mate but it just doesn't make sense to me. What she alleges I did is so uncharacteristic of me and nobody saw any of it either.
A large group of us went out and apparently I was calling her a slag and a slut which I remember because that's how we usually talk to each other, we insult each other like that a lot for the laughs. She claims I was being malicious though but I swear I wasn't. A friend of mine heard us doing this but he saw it as just banter.
She claims I slapped her, but I definitely don't remember that, in the past when I have done anything like that it was purely a joke and it's never been anywhere close to any sort of pain. Nobody saw this either.
She claims I kept pushing her when dancing but nobody saw that at all. I certainly don't remember doing that and if I did it was mostly down to it being crowded and just joking around. Everyone said I was in a great mood and I had no beef with her so I don't see why I would maliciously do that.
Then we went to another club and apparently I hit in her in the face because we had a spat. Now by this point I was gone and I have no recollection of leaving the club at all when I supposedly did this. Nobody saw this either but apparently I hit her and for the life of me I don't know why.
I really don't get what is going on? I've never hit anyone in my life, even when drunk. I don't see why I would hit her as she's my best mate by far and I have no motive too. Plus, everyone said I was happy and nobody saw me being violent at all.
Apparently I hit my best friend while drunk and I am so stressed out and ashamed of myself (will award MHO, bit long, sorry)?
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