How to undo Git - All conflicts fixed but you are still merging

I made Git pull which caused little complicated merge. I could not handle the merge so I try to rollback the code. It worked BUT git is still merging. I need to get to the state where I was before merge which is still not commited. I know how to reset HEAD but this is not commited it is still merging. Can somebody tell me how to do it?

Use git merge --abort or git reset --merge.