My girlfriend just currently turned 18 and as a joke downloaded tinder. She said she downloaded it fully as a joke to troll people and all the photos on there aren’t her, but just photos of her friend. I do believe her that it’s fully a joke, but I told her I would rather her friend just have it on her phone as I don’t feel comfortable my girlfriend having tinder on her phone while she’s dating me. Am I completely out of my element for feeling that way?