do i move on and heal, or heal and hope that he will return

my boyfriend has been struggling with depression for a few months now. he’s been in inpatient hospitals twice already and he just recently got out of the last one. when he came back, he was acting different. once we finally called to talk about it, he told me that this was the last time i would be able to talk to him until i don’t know when. he told me that he’s getting his phone taken so that he can start healing and taking time for himself, and that he’ll possibly go to a residential hospital for maybe a few months where i won’t be able to talk to him. the last time we talked he told me how much he loved me and said that he’ll never forget me, and to not forget him, along with a few voice notes for me to listen to. so i don’t know if i should just leave him in this year and move on, or heal during this time and have faith that he’ll come back to me. the only thing upsetting me is that he won’t come back like he said he would and will just leave me when he gets back.