SUBREDDIT: r/relationships
TITLE: Me [21M] and my ex-gf [Nearly 20F] of 1 year, broke up and she's already with someone else.
POST: So my girlfriend broke up with me, her reasons were kind of clear, but the break up as a whole came as a shock. 

She was my first proper relationship and I couldn't have asked for more in a partner, she's perfect for me. I'm just wondering how to get over the fact that I've been replaced in just a couple of weeks?? I mean I had really intense feelings for her for 3 years, she liked me for a long time too and we were so close. I'm trying to just state things rather than go into how I feel in this post, it's hard. I just want some advice I guess to help me get over this. 

Sorry if this is the wrong place, I don't post a lot.
TL;DR: 
Break up from first real relationship came as a shock. She's with someone else extremely suddenly. Need help to get over it.