Hard work not talking

I saw someone on the train this morning who is not talking to me. And while you're thinking 'Well, I don't talk to you on the train either Drew, I have no idea who the fuck you are,' I should mention that that this was someone who used to talk to me a lot, sometimes on the train, but who now doesn't. I used to get along with this person really well but I inadvertently offended this person a few months ago (and I still don't know exactly how) so since then it's been cold shoulder and avoiding contact with me. I won't go into how the offence was caused because I can't speak for this person's state of mind at the time but it was nothing malicious on my part and I considered this person a good friend so I'm kind of sorry offence was caused and equally sorry that offence was taken. But the train thing this morning was kind of uncomfortable. Not so much for me because I've tried to say hello and tried to be friendly to this person since said incident but I have receieved nothing but curt, one-word replies. I want to say hello and be friends again but this person's having none of it. I get on the train fairly early in the trip so get a good choice of seats. This person gets on at the last stop before Adelaide so often doesn't get a seat. I was sitting near the door this morning so when this person got on and saw me, they had to stand at the door, back to everyone, and stare out the window before opening the door and bolting when the train finally pulled in. So while I wasn't uncomfortable with seeing this person, I was uncomfortable because I could see how uncomfortable this person was in that this person went to such lengths in order to avoid contact with me. I won't go into right and wrong or whether this person is over-reacting or not because that is pointless and I'd be friends again and forget the whole thing in a second if this person so desired. But I think it's a real shame that this person now has to do all this extra work to keep up this facade of not-talking-to-me-ness when it would be so much easier not to have to keep up said facade. How tired-making the whole thing must be.