You and Rick have been waiting years for Daryl's return after Michonne said that he was still alive ,everything was getting better.

in the meantime you and Rick had became parents,you had a son who looks just like Rick,you two even joked about how you wasted 9 months only for him to look just like Rick

your son was now 4 when Daryl came back,Rick rushed to Daryl while you were standing behind them,holding hands with your son.

Daryl still hadn't noticed the little kid behind you.