Published Thursday, 04 October 2012
The British singer has been dating Eleanor Calder for over a year, but feared her mum would assume that he would cheat on the brunette beauty while he jetted around the world promoting his band's debut album.
So in a bid to put her mind at rest, he sent a message to Calder's mother vowing to stay away from groupies while away from his love.
He tells The Sun: "I was worried about my reputation at first. I remember I sent Eleanor's mum a few text messages saying: 'Please don't judge me thinking I'm like the stereotypical boyband type who is going to go around and sleep with everything that moves.'
"I was trying to convince her I'm quite a good lad but I didn't really need to. Her family are really cool actually and very understanding of the situation.
"It's important for me to treat a girlfriend with respect. My mum would be horrified if I behaved any differently - and I have sisters, and would hate for them to be treated badly by guys."