Have a fantasy of tinder threesome

I'm girl who is 24 years old. I have a handsome boyfriend for 3 years. He loves me so much and I love him too. I don't know since when I have a fantasy of threesome. This fantasy has always been on my mind.I first learned that a threesome is on a tinder for threesomes dating site. I inadvertently opened the site, where the images of three people having sex together aroused my curiosity. So I spent about an hour going through the site and found out that it was a site for three way.I was deeply attracted.From then on, I began to imagine what it would be like to have a threesome.