Halsey and John Mayer have been pretty flirtatious with each other on Instagram recently. This week, Halsey posted a facetime with Mayer in her Instagram Stories. She called it "7 am carpool karaoke with John Mayer." Mayer was all in Halsey's comments section for a post about YSL Beauty lipstick. Mayer said, "It's saying that my billing address doesn't match with the one of my credit card? I've never had this problem before. Can you text me? Thanks." Halsey responded, "wrote u a song with the help hotline # in the chorus. Sending mp3 now." Oh no. Halsey is all about this? John Mayer has been with so many famous ladies. Have you ever been with someone who has a reputation for loving and leaving them? How'd it work out for you?