Mitchell is now in a relationship with another Walford face, Rainie Cross actress Tanya Franks, he goes way back with Franks after the now-couple used to raise awareness of Alzheimer's disease together.
Friend and professional make-up artist Gary Cockerill has now told OK!: "Barbara was a massive part of our lives for 25 years. We loved her to bits and it was so sad when she passed, but Scott was so brilliant with her.
"He looked after her until the very end. He really is a special man. Of course he wanted to find happiness again – and Tanya is a really lovely lady."
Cockerill's husband Phill Turner went on to add they "couldn't be happier".
This comes after Mitchell himself stopped by ITV talkshow Lorraine, speaking about Windsor's hopes for him moving on with his life.
"She was a generous lady, a generous spirit," he shared.
"She always used to say, 'I'll go first, be upset, be heartbroken but once you're through that please live your best life'."
The former recruitment consultant then went on to gush over his new partner, commenting: "I'm very, very lucky. It started as a nice friendship and developed into something more.
"We are very happy. She's incredibly supportive of the work I do for the campaigning, so there is no fear there or worry of 'oh, it's about my late wife', because she has had her own personal family experience with this illness. She knows what it's all about so thank goodness, life feels really good.
"Me feeling miserable now or being alone isn't gonna bring [Windsor] back, and she wouldn't want that. I know that the one person who would be happy for me is Barbara Windsor."
Watch: Dame Barbara Windsor: EastEnders star dies at 83