I'm a sucker for flangst that makes my heart hurt but has a happy ending!
If you can stand something a little darker: Love, Like Jagged Glass by can't.save.this.sinking.ship. http://www.fanfiction.net/s/4996631/1/Love_Like_Jagged_Glass is heartbreakingly good! (warning:domestic abuse)
or slightly lighter: Break Me, Put Me Back Together Again by the same author http://www.fanfiction.net/s/4945548/1/Break_Me_Put_Me_Back_Together_Again (warning:suicide attempt)
Re: Here are a few that are on the flangsty side:
If you can stand something a little darker: Love, Like Jagged Glass by can't.save.this.sinking.ship. http://www.fanfiction.net/s/4996631/1/Love_Like_Jagged_Glass is heartbreakingly good! (warning:domestic abuse)
or slightly lighter: Break Me, Put Me Back Together Again by the same author http://www.fanfiction.net/s/4945548/1/Break_Me_Put_Me_Back_Together_Again (warning:suicide attempt)