Okay so it's not really a relationship story, but those dudes are very very close so it counts (please?)
Yeah so, Hawk was a captain from the start, no big deal. His squad is special forces so they work only together and shit (like bad batch yk). And on one of the missions he was supposed to install the charges with two other troopers from his squad and leave the building, but the charges went off too early and killed two other guys, leaving Hawk heavily injuried. From this moment he started blaming himself for deaths of his squadmates.
Later, his squad met two regs - Domino and Spots, who somehow survived a crash, but lost the rest of their original squad. Hawk immediately got attached to them and kinda "adopted" them into their squad. He still blamed himself, but felt like some godly shit decided that he's suffered enough and sent him his brothers back but in different bodies (he became kinda religious because of their Jedi general)
This is it I guess?? It's kinda boring idk.. I have a clone/clone lore but they're just squadmates so it's even more boring lol. But I'll tell about them too if u want ( ꈍᴗꈍ)