I work as an ops manager for a public house chain very small and about 5weeks ago we had a late xmas party

A few days ago my boss told me that a member of staff told him that i had told them, he made inappropriate comments to me that night and i had told them all about it.

I dont remember him saying that, i dont remember telling the member of staff that, i have spoken to him on the phone and said that i havent spoken to this member of staff about anything like that and if i had been offended by something he said i would have brought it to him directly, 5 weeks ago when the party happened. Ive been racking my brains trying to work out how or where this has come from and its, made me feel really ill and not want to return to work. What should I do, I'm worried this will lose me my job