How do you cope when someone that you loved/who loved you back, that you wanted a relationship with, ended up choosing someone else over you?

I can’t deny that it was hard to accept at first, many ways of trying to convince the person to pick me flowed my mind, it lasted a while, though, I realized that a person’s love isn’t necessary for me to live happily and that loving myself is better than loving someone else. I started busying myself with healthy activities such as gardening and working out, just so I could chase any thought of them from my mind. It was hard at first because them chooosing another person ruined my self esteem and self confidence but I managed to get over them after few months. I still wish the best for that person.