It would seem that you have not even done some preliminary research on the subject.
Trying to have a discussion with someone who has very little knowledge of this issue is not an easy task, nor is simplifying it.
It is a long and complex history, and whoever you talk to is going to have different answers about how long it is, what happened, and why it happened.
While nuance and much important additional information is lost in Wikipedia articles, they are a very useful resource for understanding the main points, and they also tend to be one of the least biased sources. If you are genuinely interested in learning more, this is a good place to start:
It would seem that you have not even done some preliminary research on the subject.
Trying to have a discussion with someone who has very little knowledge of this issue is not an easy task, nor is simplifying it.
It is a long and complex history, and whoever you talk to is going to have different answers about how long it is, what happened, and why it happened.
While nuance and much important additional information is lost in Wikipedia articles, they are a very useful resource for understanding the main points, and they also tend to be one of the least biased sources. If you are genuinely interested in learning more, this is a good place to start:
https://en.m.wikipedia.org/wiki/Israeli–Palestinian_conflict
If you actually do read through most of that page, I will be very surprised if your take away is still “everyone is the asshole here.”