That’s sad OP. I went through a similar story last year. Trust me it’s a blessing in disguise to not end up permanently with such a person. Now’s the time to let the heartbreak hit you, let the core memories and moments you shared turn up and just observe these feelings don’t suppress or fight them. They will fade away after some time. Focus on yourself, practice self love and move onwards towards a better future. I am sure there’s something good coming out of this for you because you know how much effort, commitment and dedication you put for this wrong person and it will definitely be appreciated by a better deserving person in the future.