What to do when you crush on your best friend?

I have developed a crush on my best friend and she recently told me that she likes me back. The problem is that she has a girlfriend. I told her that we need to stop talking about my feelings for her because it feels wrong because she has a girlfriend. And she said that she agrees that we should stop talking about it since she feels like she actually likes me.

This is so confusing. She said nothing will change our friendship and that we'll stay best friends forever blah blah... and we have probably the best friendship you could ever dream of. And since that conversation which was two days ago, we have talked less but we still do talk and everything just feels weird now. I know things will get better but I just dont know what I should do. Should we both just forget our feelings to salvage our friendship?

i dont wanna be the reason that she breaks up with her girlfriend. im not that kind of girl. i just want her to be happy.