"In AC 194, the boy was assigned to destroy an Alliance base on a colony. After planting the explosives in the daytime, he took the time to relax, planning on destroying the base that night. While in a park, he met a young girl who was out walking her dog and befriended her. That night, when he triggered the explosives, a nearby Leo was knocked onto an apartment building, crushing it before it exploded. Investigating the ruins, he found the girl's dog, dead. The direction leaves no doubt that the girl died as well. When he buried it, and possibly the girl, out of remorse, Dekim Barton ordered Doctor J to retrain the boy, saying that emotions, and especially "the humane feeling of kindness", would be a detriment and unnecessary to a "weapon". Whether this training was carried out or not remains unknown, but this incident left the boy with a great sense of self-loathing and remorse. It also would explain how Heero, in the series, displays little to no emotion."
I dunno if they were really in love, as Heero rarely show his emotions... Oh, sure. You can taste some of my cookings. But, I'm just an amateur actually.
Gundam Evolve
Mobile Suit Gundam MS IGLOO: The Hidden One Year War
Mobile Suit Gundam MS IGLOO: Apocalypse 0079
Mobile Suit Gundam MS IGLOO 2: The Gravity Front
Mobile Suit Gundam
Mobile Suit Zeta Gundam/A New Translation
Mobile Suit Gundam ZZ
Mobile Suit Gundam: Char's Counterattack
Mobile Suit Gundam 0080: War in the Pocket
Mobile Suit Gundam 0083: Stardust Memory/The Afterglow of Zeon
Mobile Suit Gundam F91
Mobile Suit Victory Gundam
Mobile Fighter G Gundam
New Mobile Report Gundam Wing
Mobile Suit Gundam: The 08th MS Team/Miller's Report
After War Gundam X
New Mobile Report Gundam Wing: Endless Waltz
∀ Gundam
Mobile Suit Gundam SEED/Special Edition
Mobile Suit Gundam SEED ASTRAY
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Mobile Suit Gundam SEED C.E. 73 STARGAZER
Mobile Suit Gundam 00