I don't think it's that we're forgetting all that and what led to the misunderstandings between them. It's just that seeing them dance around the main issue over and over again, despite all the subtle and not-so-subtle hints, is kind of hilariously frustrating. With all the tension that's built up until now, it'd be almost cathartic to see them sit down and talk it out.
Or at least, that's why I'm eager for Chase to finally figure it out. Idk about the others lol

I don't understand why y'all think it should be obvious to chase that he's Pete's father. First of all, chase doesn't remember that he spent his rut with Joshua, he doesn't even remember that he marked him too. As far as Chase is concerned, the first time he met Joshua was through this bodyguard job. And secondly, it seems that female alphas can get omegas pregnant as well, if chase's sister Larien can get a female omega pregnant (as learned in desire me if you can), there is no reason not to believe that female alphas can get male omegas pregnant as well. Chase knows that Joshua used to get around a lot with women so it's natural for him to believe that he may have gotten pregnant from a female alpha.