My friend kissed me by surprise?

Anonymous
On Monday I was talking with my friend who I've know for a few years now and out of nowhere, she put both of her hand on the sides of my head and pulled me in to kiss her. I was caught off guard and didn't know what to do and went along with it. She told me afterwards that she wanted did it as practice for her boyfriend.
Now here's where the problem comes in, someone saw that and practically the whole school knows now, I didn't tell my girlfriend about it cause I didn't know how to, and she found out from someone else. I tried to explain to her over text earlier today (she wasn't at school cause she was celebrating her mom's bday) that I was the one that was kissed, not the one that did the kissing. I think she found out on Tuesday. She also told me that we would talk tomorrow. I can tell she is really upset but I don't know what more to tell her. Please help me. I really don't want to lose her.


Updates
+1 y
Thanks everyone for the advice. But it is now useless. My girlfriend broke it off
My friend kissed me by surprise?
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