Well, poor Bojo, if you've already tried all of those maybe it's time to approach the issue differently: tell her something like "OK, I did this terrible X thing X days (nights?) ago, and I'm sorry as h*ll about it, but I see no real point in apologizing ad infinitum. I love you and that's about it - take it or leave it." Just don't use those words...
What I mean is that sometimes you simply try to apologize too much. If you really mean it (and show it), once-twice should be enough. The fact you did something wrong still remains, but no number of apologies can change that anyway...