Vent and advice

Guys, I was caught up in the events of Sunday night, and I'm just so confused and indignant. How can three months have passed and I know my life has improved, but I miss her every day, and she, after the rejection and betrayal, simply can't miss me or regret it or anything like that? I mean, I've already accepted that she doesn't miss me or see me as a person, but it's too difficult. Does anyone have any advice on this?