i dont agree that the person wont come back if you dont engage them. My ex came back twice & i didn't try to get him back after a NC period. after we broke up we pretty didnt talk for almost a year. ( i tried to talk, he didnt respond). After i had stopped trying to contact him & moved on, he reached out to me. We talked as friends but ended up not talk for 2 months. i didnt try to contact him at all. He reached out to me after 2 months and wanted to get back together. HE reached out to me after i moved on & stopped reaching out to him. if youre the one doing the NC period, I dont think you have to engage the other after the NC period. If they miss you & want to work it out, they will reach out to you. The NC period will give both of you time to work on yourself & reflect on what you want.