My girlfriend said she's experienced double penetration with two men in the past. Isn't that really weird?

My girlfriend and I have been together for 4 years. She hasn't told me about it until now. But yesterday she told me she had done it in the past. Moreover, while we are preparing for marriage.. I feel really awkward.. I don't know what to think and what to do.. I can't understand why she did this.
My girlfriend said she's experienced double penetration with two men in the past. Isn't that really weird?
Post Opinion