Working on relationship when separated

Dear all, 

I'm new to the forum and just finished reading The ADHD Effect on Marriage. A brilliant book and felt it was written for me and my adhd partner. Tearful at times and finally I didn't feel so alone anymore. I am non-adhd and my male partner is adhd (albeit undiagnosed at the moment). I couldn't manage the feeling of loneliness any longer and so we separated almost 6 months ago. We decided not to cut ties and we wanted to try and work on our relationship as we've been together for 12 years and we'd love to see it work. He is a truly kind and lovely man, I just reached a time when I could feel the resentment and unhappiness taking away the love I had for him and I so desperately want to get back to how I felt about him years ago.

We both want to put the work in from what we are learning from the book, but we are seperated. Is it possible to work on the suggestions in the book whilst not living together? I'm mindful that I can't ask him to come back and live together just in case his commitment to working on our relationship failed and he doesn't put in the work needed. I just can't go through separation again. Also, it was so painful for him, I can't do that to him again. 

My main question is,,, can we put in the hard work and focus needed in trying to rebuild our relationship, whilst living apart?

Thanks for reading.

Jo