I'm going to avoid one of my gf's dogs because I think it has pink eye
Why do you think the dog has pink eye?
The dog was very aggressive to me. I think it's a bad tempered dog.
This is a wise decision. Pink eye is infectious, and the dog could attack you as well.
I should be fine right? The vet said his eyes were fine.
That's good you took the dog to a vet. I am glad the dog is fine and everything turned out well. If you have any concerns for your pets in the future, it is always best to consult a professional.