I saw a condom in a woman's vagina

I met this girl last week and we had sex two days ago. today I saw her again and asked her for sex. Fast forward we went to a guest house and we started playing.
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I inserted my finger in her vagina and felt something like a ring. I asked her and she said it's nothing, so I inserted my finger again and felt it again and pulled my hand out and behold it was a used condom. shocked I asked her and she said "Oh I put it there myself". I wanted to know what that meant and she started getting defensive. So I asked her to get out of the room and that I never want to see her again.
Honestly I don't know what that means but I was totally shocked tonite. Could it be jazz or she had Sex and the guy forgot the condom inside her? In all I was stunned coz in my entire life I have never heard of this kind of thing before.
I told her never to contact me again and I promised her that I would share her story so if she a reader of this blog she will see this story. My own is that I want to be thankful because na today my eyes open. Please share this story... I want to know if any other person has had this experience before.