Do you cheat on your girlfriend if she cheated on you?

Technically yes. While no intercourse can happen directly, I would consider it cheating.

I guess it all depends on your definition of "Cheating"

Do you consider cheating having sex with someone else?

if so, then technically not because two females cannot produce intercourse. Also, if that is your definition of intercourse what is your intentions in the relationship and why not be in an open one?

If not, then yes it is blatantly cheating. By blatantly I mean subtly because how do you cheat without intercourse?

^^ The comment posted above is False Information. I am a Bisexual and although having a girlfriend and boyfriend at the same time might sound alot like cheating it's not. You have to know the basic's in that relationship. IF you LOVE your other half, then why sould this question even be asked. What I wanted to know is "If I was inscure about my realtionship would it end in a break up?" Yet I'm now answering my own question.

It IS cheating. i think cheating is just going out with someone else and having two lovers is deffo cheating btw do they know about each other?

It's only cheating if you're hurt by it.