You said in another thread it would have been 4 years together if not for the breakup. That is a long time to be with someone. I’m not sure what the breakup was like, how you felt about it, etc, but in my opinion it’s always best to have time apart after a breakup, including not talking, even if it happens on friendly terms. I think it’s way too weird for the mind to try to suddenly switch from years as a person’s lover to just friends, and if you didn’t want the break up to happen i.e. you were dumped, then it’s like a thousand times worse.
Or basically what I’m trying to say is that it would be completely reasonable if the breakup caused a huge spike in stress for you, and then if that huge spike in stress triggered a delusion or something. I think people need space after relationships end.