I Am Willing to Apologize When I Have Wronged

I find that an apology works wonders with people and as I make plenty of mistakes I do get used to apologising. What I can't stand it when people stubbornly refuse to apologise even when it's obvious they are in the wrong. I mean I was late for my boyfriend yesterday but as soon as I said sorry the annoyance on his face melted and the relationship returned to normal .