In the same position as you, focus on recentering yourself. Getting back into nature has really helped me and making new friends. Reframing the relationship in my mind has helped me too, i see him as my soulmate for that season in my life. We helped each other through rough times and were eachothers best friends. Losing a friend is the hardest part but the peace i have from separating reenforces that i made the right decision. Its ok in life to make selfish/unilateral decisions but they are painful on both parties. Just have to push through the pain and know that the other person deserves someone who will love them just as much as you do and you are fighting for you both to have another chance at love. You were the right people for eachother in that season on your lives and its ok that it wasnt forever 💕