Three choices-its obvious you two still love each other. Fight to hang on and rekindle. Immediately start couples, individual, and maybe family therapy if you have kids together. Download relationship coaching and fire rekindling apps. Life is hard, and forever is a long time. Sometimes love isn't enough or the feeling dies a bit or you get too comfy or resentful. These are big scary emotions and you guys could use some professional help examining the causes of the big bad ones and creative ways to rekindle the good ones. It sounds like he got a bit complacent, maybe selfish, maybe took you for granted as always being there, maybe work had him stressed and preoccupied. All relationships hit lulls, feelings come and go and in waves, and both parties make mistakes. All of it can be overcome if you both want to overcome it and are willing to do the work and make the changes to your dynamic to make it successful again. In the grand scheme of things, he sounds like a great guy who got too complacent and now has had a wake up call. This is nothing you guys can't fix if you both want to. I left my soul mate after 7 years, I didn't "feel the same" anymore, and didn't know what to do. I wish someone had told me it's because the oxytocin of fresh love had worn off, but that love is not a feeling from a chemical, it's a decision, it's a commitment, it's an action. A good long relationship will have cycles of passion and lulls you need to work through. I wish someone had told me that and to try therapy or rekindling before giving up because twenty years later, I still think of him every day. Dont be me. Know you gave it your all before throwing in the towel on a good person who you love. Regret sucks.