não abre o commit do merge

Bom dia!

Faço o passo a passo conforme a aula, e aparecem algumas diferenças =/

após alterar o meu arquivo, dou um git status, porém no meu caso aparece: Your branch is ahead of 'origin/master' by 2 commits. (use "git push" to publish your local commits) nesse caso eu realizei o push

$ git status
On branch master
Your branch is ahead of 'origin/master' by 2 commits.
  (use "git push" to publish your local commits)

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   arquivo1.txt

no changes added to commit (use "git add" and/or "git commit -a")

$ git push
Enumerating objects: 8, done.
Counting objects: 100% (8/8), done.
Delta compression using up to 8 threads
Compressing objects: 100% (6/6), done.
Writing objects: 100% (6/6), 628 bytes | 628.00 KiB/s, done.
Total 6 (delta 2), reused 0 (delta 0)
remote: Resolving deltas: 100% (2/2), completed with 1 local object.
To https://github.com/AlexandraEspindola/alura-git.git
   ab49fcf..5c8335a  master -> master

Realizo um novo git status. Aí, aparece "Your branch is up to date with 'origin/master'." que seria "seu branch está atualizado em relação ao master, certo? De qqr forma, aparece o modified.

$ git status
On branch master
Your branch is up to date with 'origin/master'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   arquivo1.txt

Realizo o git add

$ git add arquivo1.txt

E depois o commit

$ git commit -m "tentativa de abrir o vim"
[master 5f24aaa] tentativa de abrir o vim
 1 file changed, 1 insertion(+), 1 deletion(-)

Ai finalmente o git merge

$ git merge titulo
Already up to date.

E então...nada do vim :( ainda, se eu dou novamente git status aparece o seguinte:

$ git status
On branch master
Your branch is ahead of 'origin/master' by 1 commit.
  (use "git push" to publish your local commits)

nothing to commit, working tree clean

O que quer dizer esse "your branch is ahead of (origin/master) by 1 commit"?