I think if you make a mistake and mislead people, maybe make their lives and others worse, then you should apologise. He didn't do that. It was all, me, me, I was just doing my job, that's the excuse of people down the ages.
Yes, I agree that there was a degree of seeking "forgivehess" there - to be exoected I think.
We do not know how long ago this man decided he had to get out of his predicament before writing this. I would wager on "not long". This would be a traumaticcevent in most people's lives, not conducive to straight thinking.
When breaking a longish emotional bond, with a parther say, it can take a long time, maybe years of heart rending tension and insincerity, before the break is finally made. Then it can be a case of sudden anger, just walking out, considered apology or grovelling guilt. Out of those perhaps the middle two are the sanest, if one is not quite a mature action.
All for condidered apology, if or when the individual is capable. If not capable is that due to the trauma or to some personsality disorder, maybe sociopathy?