It hurt, a lot. Having to watch the guy you viewed as a father figure for almost a year be changed into something else entirely; a weapon. It was All for One's plan and there was nothing anybody could do about it by the time that Tomura had awakened and the destruction started...
After the war was so much harder than during it. There was a long period of time where you didn't even know if Tomura was even alive since you were knocked out of the war before anything happened to him.
You hadn't found out yet, but Tomura, by some literal miracle, had survived by the sheer luck of timing and trial by those UA students.
Somehow, someway, Izuku Midoriya had pulled some sort of strings and got some sort of word through so that Tomura didn't have to spend forever in Tartarus, and somehow managed to get him a house arrest with quirk cancelers... not like he'd try using his quirk anyways.
You, after being told that he was alive, weren't allowed around him for, honestly obvious reasons, for a long while for some sort of safety precaution. You were stuck being taken care of by Shota Aizawa since he was the only one who volunteered to even do it.
That was, until today. You were informed that today was the day that you could finally see Tomura, the man you viewed as a parental figure, after the year or so of not.