Dreaming of gf cheating is a very common dream and it usually is a sign of insecurity and doubt as per dream interpretation and meaning. It is common to feel gf is cheating on me. The dream is asking you to clear your doubts and get things in line before proceeding with the relationship. Dreams of gf cheating also mean you will soon be jealous about someone.
Dreaming of gf cheating and you know the person in the dream means there is something happening behind your back and you are not aware of it.
Dream of gf cheating and you are angry and unhappy or crying in the dream then it is a clear sign that there is something wrong in your relationship. You should sort it out with the help of a mature friend or person.
After the dream you should also give a proper thought about your relationship. You should avoid acting in anger or haste.
For some reason you are happy in the dream, then it means you want the relationship with gf to end and you are just looking for a good reason.
Dreams of seeing gf cheating with multiple people is a sign that you are in a bad or immature relationship.