I think Atton's jealousy and resentment of Mical goes a lot deeper than "he stole my girl."
Firstly, Mical is roughly 10 years younger than Atton/the Exile. Which means, Mical - while his life path was certainly altered due to the Wars - never had to fight in either the Mando or Jedi Civil Wars. For the most part, he's lived in a post-war society and doesn't have a jaded worldview. Sure, Mical criticizes the Order but there's no hatred; he's simply disappointed in their shortcomings. He very much still has faith in the Republic, because he never really saw how much of a clusterfuck the administration was during wartime. So Atton, right off the bat, sees Mical as this irritating kid who doesn't know what he's talking about. And the fact the kid's a Republic spy (and a diplomatic spy at that, so missions are mostly fact-finding involving politics rather than getting a blaster pointed between the eyes), is just extra salt in the wound. Sure, he's "serving" in the Republic military, just with all the glory and none of the PTSD, lingering medical issues due to combat injuries, and none of the lifelong problems with substance abuse.
Also, I headcanon young Jaq (before getting severely mentally fucked up during the War) as a bit of a wide-eyed "Gee Whiz!" idealist. And now Atton sees this mirrored in this pretty boy wannabe field physician-turned-spy. Except Mical never gets the idealism smacked out of him, assuming the Exile's LS. In fact, this kid seems to be rewarded for his idealism at every turn.
Hell, I bet the fact that Mical's a Republic spy and that's another lightside mirror to Atton being a Sith assassin, just rubs Atton all kinds of wrong.
Second, Mical is perhaps a bit naive (okay, more than a bit) but he's very intelligent. He's openly a bookworm and, say what you will, Mical was the only one to discover Kreia's plan on his own. Even Kreia says he's a "wasted" pawn of the Republic, that he could have been so much more. She, grudgingly, respects him (as much as Kreia respects anyone outside of Revan and the Exile). So, once again, compare this with "the fool", Atton, who is clearly also quite intelligent in his own way. However, nobody really sees that because Atton acts like a dumbass in order for people to underestimate him. This probably futhers Atton's resentment - this snot-nosed nerd gets to flaunt his brainpower, but Atton's always flying under the radar.
Even worse would be if young Jaq had dreams of maybe going to a good university after serving, maybe hoping to use whatever the Republic's version of the GI Bill program was - only for Jaq to be too messed up after the War and not to mention he deserted, so he's probably thrown all chances at getting military benefits out the window.
Now to throw the match into the kerosene-soaked mess of Atton's hatred - is when the Exile potentially starts to grow close to Mical. It's like, of course, Atton feels like garbage not worthy breathing the same air as the Exile. But he'd hoped that perhaps she'd at least never grow close to anyone else. That they would stay in a state of relationship limbo forever.
So... on top of everything else, the kid gets her too?
Atton would be seething, even if he's LS. I think the only reason LS Atton restrains himself from cornering Mical on Malachor and shoving his lightsaber through his eyesocket, is because that would upset the Exile. If Atton's DS, all he feels is his rage, bitterness, and resentment - plus the overwhelming desire to see a Jedi's life bleed out on the floor.
Meanwhile, I think Mical regards Atton with bemused pity. Also he shows him compassion, since Mical is emotionally mature enough to see Atton is a very broken man.
Which of course just pisses off Atton more.
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