agree with the idea that most people do keep trying to do better but we tend to fail a lot and remake our mistakes. I do believe we as people are fed the same situations that we fail at repeatedly until we figure out how to better deal or cope with them.

The people that I lose my patience with are those that do not think that they are the way they are and believe they are better than what is the reality. The ones that are not self aware and dont' care to be. I don't write off apologies unless it's a habit of that person to give a half hearted apology and hope things are fine because they do. Then rinse, repeat.

I think it's a matter of being discerning enough to know the difference between people that are genuinely trying but keep hitting walls and those that don't care to change. Writing off everyone expecting the worst is no better than being overly trusting of everyone and being gullible. either extreme is going to put you in a world of hurt, emotionally.

don't lump everyone together. at one point you talk about a certain friend. If you have a problem with this person's apologies and repeatedly doing something, observe that person as they are, a unique and singular individual, it does not mean all men, all single people, all women or any other whole group is exactly the same no matter how you try to frame it. deal with the one person individually and figure it out with them.

It seems like your problem may be global thinking. generalizing every problem and lumping it with a global statement related to whole groups of people. this is always a mistake not only in being inaccurate but also in not helping with how you get on in life. being disappointed in people in general is not going to make your outings in real life very pleasant!