Most Helpful Girl
I'm quite stubborn and I hold grudges (which is probably a really bad thing) so I wouldn't approach them. If they don't want me to talk to them, chances are they wouldn't listen to me even if I wanted to apologise.
If I had to though, I'd just text them an apology (if I was wrong) and say anything I wanted to say and giving them an opportunity to resolve what had happened. I'd write it out first so I didn't forget anything. Then it'd be up to them to act on what I'd said, either way I'd have closure.1