Shawn Mendes improved his relationship with Camila Cabello by showing "vulnerability"

In a chat with Alicia Keys ahead of the new Netflix documentary, 'Shawn Mendes: In Wonder', Shawn said: "(I realised) I had no vulnerability with my girlfriend, and realised the second I showed that to her, she would fall deeper in love with me.

"And the second she showed that to me I would fall deeper in love with her, that's the most attractive and beautiful thing in the world, why didn't anyone tell you that the second you blush, people like you more?"

Shawn also explained to Alicia that he enjoys writing tunes that have come from the "heart" and wants to express his feelings in song.

The 'Stitches' hitmaker explained: "For me, I found that I started really young, being a writer and realised whatever I was told, from this or from that, the path to the most people liking your music is to say the most neutral thing. And to say the thing that can affect the most people is by not saying a whole lot.

"I've always loved the music I've made, it's beautiful, it's about falling in love. Then I went one step further and I wrote a song called 'In My Blood' which is about anxiety. You don't have to be an expert to talk on matters of the heart. You just have to be in touch with the heart."

Shawn added: "I feel like I never gave myself permission to say that stuff before, I always thought you had to be some sort of articulate, well-read professional. But you don't at all, you don't have to read one book to know what's right or wrong."