You have been adequately advised that you are conclusively negative. The idea of "late" antibodies is a myth. There isn't anything more to say about this event or your testing.
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Cheating ex boyfriend. Gave me and sti and we obviously were not being safe.... thought I could trust him. Funny thing is I found out after leaving him! So this has made me so anxiety ridden. And nervous
You're over-thinking this. It's ~90 days. But if you take it at, say, 88 days, your result will not change. Even 90 days is conservative given the sensitivity of modern tests.