Some pieces of the bewildering puzzle were coming together now. They were hardly pleasant ones either. Whatever bad thing that had befallen Maggie, had been due to Merle in part. Daryl, ever the loyal brother, had subsequently chosen Merle over the rest of them. Somehow that made him angrier than anything else. He understood it, but he didn't like it. What would they have done without him, especially with Rick in the state he had been in? Their future had already looked pretty dismal.
Stuck in those thoughts, Glenn stayed quiet. He didn't move an inch, had no idea what to even say. So, he was fortunate that Daryl had something to add. Glancing his way, he knew Daryl meant it. Glenn trusted him, hell, he trusted him more than he did Rick, and that said a lot. What Glenn couldn't figure out was why anyone had let Merle come back.
Better yet, how had Glenn let that fly? There must have been more to it, more than he was prepared to hear.
He felt bad for Daryl, not in a piteous way, but in the way one ought to empathize with a friend--a brother. Glenn knew he was only keeping his emotions in check over this because he hadn't experienced it firsthand. Didn't mean he was any less angry or upset about it. He didn't like the thought of Daryl ditching them with Merle, and he certainly loathed the idea that Merle had been allowed in the prison after causing Maggie harm.
Glenn could get over whatever bad things Merle could do to him, but when it came to Maggie--he would always be unforgiving. Glenn was protective of her, would die for her in a heartbeat, and couldn't tolerate that one sliver of information that outweighed all the rest: what the hell had the Governor done to her? He couldn't ask though, not yet. Not now.
Instead he purposefully downed the rest of his beer and stood. He needed some space, some air--something. Right now, looking at Daryl would only perpetuate the anger that he didn't want to hold toward him. Good as a guy as Glenn was, he hated holding contempt for anyone, especially when there had been nothing Daryl could do for the better, and because it wasn't his fault.
"Coming back, that was probably enough," Glenn said tentatively, fingers flexing at his sides. "I gotta.. I gotta take a beat, Daryl. I'm not..." He had no idea what he was going to be walking into when he came here, but this was not his own personal worst case scenario. He hadn't anticipated this. "Before I say something stupid, gotta go. I'm sorry, man."
Glenn, shaking his head, moved to the front door. "Thanks for the beer...?" He offered lamely, because his humor had a hard time coming out between the violent waves of rage threatening to overcome him. "Yeah... later." He didn't wait much longer before leaving, too caught up in the issues rattling his brain to stick around.
But, he knew Daryl would understand. Eventually, through everything they'd been through, he always had that.