I pass up this one all the time and today I suddenly want to read it, forgot the name though. Clues:

• It's a shoujo about this girl who looks sweet on the outside but has a foul mouth or is just plain foul-mouthed so people misunderstand her.
• I remember it having a cover similar to Chocolate Cosmos.
• the romance may or may not be a student/teacher one, I forget.. but if it is, it's not Oresama Teacher

You're my Girlfriend?

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Yup! Thanks it's this one exactly. My memory must be horrible, only 1/3 of details are correct lol