My girlfriend has recently discovered she's bi qnd I don't know how to take it??? Pls help!!?

Being bi, Les, or gay has nothing to do with her going round and picking up strange girls. Let's say your gf was straight. Dosent mean that she can chest on you an have sex with another guy think alittle. Okay off that subject support her 100%. She's with you for a reason. Not cause she waiting to get laid by the next bi or lesbian girl she sees. Relax. Cheating is bassed on trust and compasion. Not sexuality. Good luck :)