you might want to either a)brush your teeth more than once a day or b) invest in some gum.

That was rude but how bad was your breath that she said that?

You might want to invest in a good mouth wash and some breath mints, FYL op.

you need a bottle of listerine.

get some breath mints

Maybe you have tonsil stones, or a cavity? Terribly sorry, OP, that must've been mortifying. But maybe make an appointment with a doctor or dentist, in case something is wrong, beyond just needing to brush teeth.

Also brush your tongue when brushing your teeth. Helps with bad breath. Mouthwash after makes a perfect combo. Hopefully you can get it worked out OP.

She was already your girlfriend before you even kissed? That's kinda cute, although pretty uncommon I think. I hope your following kisses won't be that awkward, you might want to get the source of that bad breath checked out (unless your hygiene is really bad, it's pretty likely it comes from a disease).

I wouldn't want to experience something like that, so F*** your girlfriend's life too.

At least she was honest about it, rather have that then she avoiding kisses you ever again and never telling you the problem. Buy some mouth wash and brush your teeth three times a day.