Me and dp were like that.
I met him 8 weeks after he left his wife and 10 days after I had left my husband. We attempted a relationship. It went spectacularly wrong. But due to circumstance we continued to be friends. He was staying with my best friend (related to her) and she was my main support on fleeing my abusive marriage. I stayed there alot. We were just friends for about 5 months. We talked a few times about how the timing of us meeting caused it to go so wrong.
We became close friends. He was a great support to me. Helped me move and decorate my new home, making sure it was all ready for my kids. He was there when I felt broken. No romantic relationship. We talked and decides to try again.
Neither of us wanted anyone else. I realised if he met someone else, I would devastated. So 3 years later, we are together. I love him. I know now I loved him when we werenr together. Though at the time I would have said there was nothing between us. Just friendship.
He has always made me feel safe. I can only describe it as, he makes me feel like home.
The I suppose the truth is we werent ready for a relationship, but actually never let eachother go really. We became best friends. Which I am happy about.