they like girls
'I'm bisexual'
If she is someones girlfriend and not the lesbian's then she might not be a lesbian. She could merely be friends with this girl. If she is the lesbian's girlfriend then yes she probably is then. :)
Then your a Lesbian?
She tells you that she is a lesbian.
Be there for her and support her. DO NOT FRECKEN DUMP HER!
Sure, why would you keep a secret from your significant other?
just come out and tell her what you want to do
This question is rather broad, but in general, open communication is best. Tell her you love her.
Well that'd be a lesbian cheater.
With a girlfriend.
What if she already knows? or is it a secret known only to you?