HOW DO I REACT WHEN MY GF SAYS SHES STRAIGHT!?!?!?!

Well 你 might be the one exception to her normally straight preferences, 或者 she might be slightly bisexual.

If she's saying it in a way that means she doesn't like 你 anymore, I would try to resolve the problem either 由 talking about it 或者 breaking up with her if that's the only way.

But if she's saying it in a way that shows she's feeling vulnerable and scared, try and comfort her and help her through it.

I can see how this would be confusing. But at the end of the day, your girlfriend defines her own sexuality, on her own terms. She may have 说 that because she is in 爱情 with 你 (as she said) but feels very little attraction to any other women. It's not uncommon.

As to how 你 react...let her define her own sexuality, in her own words. It's not for you, 或者 anyone else, to do that for her.

爱情 is weird, it tests us in oh so many ways, 你 have all this want to be happy with an equal,and your 心 seems to be on a string.allow her to go if 你 trully 爱情 her,as if 你 hold her to tight 你 may hurt 更多 than yourself. be happy 你 can talk,even if its trivial,best to be freinds for ever, than someone 你 have to walk away from,it hurts,for your 心 is good, and an equal deserves an equal.chin up, smile 你 are a good person,just 更多 romantic than others, good luck in your endeavours;-]