Mendes' love for Cabello goes much further than just taking pics for her. In fact, in a trailer for his upcoming Netflix documentary, In Wonder, Mendes reveals that all of his songs are about his girlfriend of more than a year.
"My song comes on the radio or something and I'm like, 'Everything's about you. They're all, they have always been about you,'" Mendes says in the trailer. "She goes, 'What do you mean?' Like, 'They're all about you. Like, every song I've ever wrote.'"
Digging deep to write all those songs about Cabello also allowed Mendes to be a better boyfriend.
"I thought that I was a pretty open, emotional guy until I started being in a relationship with someone that I really, truly love and, realizing that, 'Oh no, I really have this big ego, and I don’t want to show her that I’m hurting and I don’t want to show her that that offended me, and like, I want to be the man, and I want to be strong in this relationship,'" he said in a radio.com interview earlier this month. "It actually was hurting our relationship."