The couple were first snapped together in 2019 at several public events, before announcing their engagement in August 2020.
He told podcast host Steven Bartlett: “I feel like, more than anything at this point, I’m more disappointed in myself [that] I keep on hurting people. That annoys me.
“I’ve just not been very good at relationships and I know what my pattern of things is with relationships at this point.
“I’m just not very good at them so I just need to work on myself before I put myself on to somebody else.”
He added: “That’s where I got to in my last relationship. I just wasn’t giving a very good version of me anymore, that I didn’t appreciate and I didn’t like being.
“I can honestly say I feel better out of it. I didn’t feel good doing what I did but it had to happen. That’s just the corniest way of saying it was the best for us both – whatever, cool, nice story, bro.
“But it just feels like that. I know it was a problem so I need to sort myself. I already feel good. It has already got me more concentrated and I hope she is happy.”
The 27-year-old previously dated Girls Aloud singer Cheryl between 2016 and 2018, with their son Bear born in March 2017.
One Direction shocked the world by splitting up in 2016 to go on an indefinite hiatus, with the group’s members going on to have a number of solo projects each.