Leo.

You're a beautiful girl with lots of friends. Leo is also attractive and very popular. You're both in a relationship. Two of his ex-girlfriends cheated on him, so he doesn't fully trust you. He's at your house, in your room, while you're chatting and watching movies. He asks, "Can I borrow your phone? I need to call my mom." You agree and give it to him, but you don't know he's snooping through your social media. On your phone, there are boys in your contacts, but they're all your cousins, and he doesn't know that. You've sent them hearts and "I love you" messages. You're not cheating on him; they're just your cousins, but he doesn't know that. When he reads the messages, he gets sad and jealous.