I'm a major Emo fucker, so this question was seemingly made for me. The absolute #1 Noise breakup album is I Am A Lake of Burning Orchids's Summer in my Veins. PE-inspired, but it's definitely about regret and longing as opposed to raving hatred a la SJ. It's one of my favorite noise records. Crazy "harsh ambient" textures, shoegaze influence, arpeggiated synth loops straight from 90's dance clubs, crazy effects-warped screams, fucked up digital clipping, I haven't heard anything else that hits all the same emotional and timbral beats. it really is like Screamo (good, DIY Hardcore-derived Screamo as opposed to bad, Pop Metal-derived "Screamo") through the lense of noise and electronic music. Primo breakup noise.
That said, the works of the love and sexuality centered Navicon Torture Technologies are also great. I quite like NTT, especially Pure Skin. The Stars and The Scars is total breakup PE even if you can't understand a word Leech is saying (which I certainly can't).
Prurient's The History of Aids takes lyrics straight from the 13th century Persian love poet Rumi, who once said "You have to keep breaking your heart until it opens." So even though I once again can't hear a fucking word Dom's saying, I have to assume lost loves are an essential part of the mix.