I didn't know about the book on apology languages. Very interesting, thanks.
Another thing that makes apologies believable is questions. Ask your H questions like "how long were you hurt? Did it relate to something else? How often do you think about it? What reminds you of it? When did you realize how much it hurt you? What should I have done?" When I'm asked questions like this, I feel a wave of optimism that the other person is really trying to get me and the apology is heartfelt.
M39 D6 D3 (at S) S 2014-09 D 2016-09
"You can't start a fire sitting around, crying over a broken heart" - Bruce Springsteen.