The couple split up last month but the model has remained close to The Saturdays singer despite their ''painful'' separation.
He told more! magazine: ''We are still friends and I spoke to her at 4am in the morning the other day. We're too close not to talk.
''It was 10 months and she's a remarkable girl, everyone loves her. She's so vibrant and lovely to be around. Of course it's been painful and I miss her, but that's life.''
Despite their split, David hasn't ruled out a reconciliation in the future.
He added: ''It's never nice when a relationship ends. I think we've both been very mature about the situation and we both decided that our relationship was quite a lot about timing. This wasn't the right time so we both felt it was right to end it.
''But you never know about the future. Of course there's a chance for us, never say never.''
David recently admitted he had envisioned growing old with the 24-year-old blonde beauty.
He said recently: ''We'll be spending the next 40 years together.
''I can definitely see us lasting that long. We don't need to worry about the future.''