The 'That 70s Show' star may have split from the 'Heart Attack' singer but he is actively keeping an eye on her after she was hospitalised following a suspected heroin overdose.
A source told Us Weekly magazine: "He is continuing to support her and has been actively following up and checking in on her when he can. He has made it a priority and they've never fallen out of love.
"Even though they are broken up and not together right now, when a loved one goes through a crisis, your true colors of who you are as a person come out and he has really portrayed himself in the same way that she's spoken about him in all of her previous public interviews."
Demi has now gone to rehab after spending some time in hospital. Following her release from hospital last week, Demi broke her silence over the incident and thanked fans for their support as she vowed to do whatever she could to get back on the "road to recovery."
She wrote in an open letter posted on Instagram: "I have always been transparent about my journey with addiction. What I've learned is that this illness is not something that disappears or fades with time.
"It is something I must continue to overcome and have not done yet. I want to thank God for keeping me alive and well. To my fans, I am forever grateful for all of your love and support throughout this past week and beyond. Your positive thoughts and prayers have helped me navigate through this difficult time. I now need time to heal and focus on my sobriety and road to recovery. The love you have all shown will never be forgotten and I look forward to the day where I can say I came out on the other side. I will keep fighting."