The rocker, who has battled substance abuse issues for a decade, began dating the beauty after meeting her at her 31st birthday party in 2005 but their two-and-a-half year on/off romance was surrounded by controversy.
Moss went on to marry The Kills star Jamie Hince, but the supermodel recently called Doherty to check up on him - and the former Libertines star was touched by her support.
Doherty tells Britain's Mail On Sunday, ""I got a call from Kate a couple of weeks ago, which came as a surprise as we haven't exchanged a word since it ended. And believe me, it ended nastily.
""But she was friendly and just asked me what I was up to. She wanted to know why I hadn't written any songs recently and whether I was still taking drugs. She said she was staying clean and that she was very happily married.
""It came as a huge relief to hear from her and I felt a weight lift off my shoulders. It was a really important call because it put a few unresolved issues to bed for me. She told me that despite everything that had happened between us, she was still rooting for me and that was nice. It means a lot to me to know that.""