I don't know all the facts, but I'll tell you what I know.
My husband had an ex he remained friends with for years that got a little too attached to him. At one time he was interested, but he met me and we got married. As he tried to wean her off him, he avoided her and hoped she would get the point - she didn't. He finally asked for very limited contact with her, and ignored much from her over the time we were planning our wedding.
She contacted him last week for help with something. He didn't tell me, but I trust my husband. I found out about this a few days after because he was very crabby and I asked what bothered him. Apparently she asked for help, found an answer, then told him she didn't need his help anymore and thanked him. Not a big deal, really, but it bothered him for some reason she didn't need his help. Then, she apologized for contacting him, and it seems he thought she was implying he stop everything he was doing to help her and that really irritated him.
I don't really get what he is upset about. She asked for his help and then found the answer she needed - that's good, it meant he didn't have to put the effort into helping her. She apologized, which in a way was nice, I don't think she should have contacted him in the first place and I don't think he should have responded. He asked her not to, I think she felt badly for doing so. I don't think she needed to tell him that though. It kind of seems like she wanted an excuse to talk to him, and once she did it thought twice about her actions. But quite honestly, he didn't need to help her - he decided he was willing to. So his getting upset, isn't that his own fault for helping someone he didn't want to talk to and then by taking offense to her apology for contacting him in the first place?
I see things way more simple. If someone I didn't care to talk to asked for my help, I wouldn't respond. If someone did say something offensive I would maybe get upset, but if I don't care about them, I won't be bothered much by what they say for long. He seemed to really be aggravated by this woman, and I don't know why it bothers him and why he read so much into a simple apology.