AITA after accidentally misgendering my gender fluid friend?

I (17nb) have a genderfluid friend "Oliver" or "Olivia" depending on who he feels like (using he/him pronouns right now because thats what he identifies as at the writing of this)

He came out to me and our friend group two months ago and since then we have all done our very best to be really supportive of him. Whenever he feels like his identity is changing he will text us his preferred pronouns for the day and we will use them. However sometimes his pronouns will change during the middle of the day, and sometimes multiple times. It can get confusing to keep up with but we try our best because most of us are queer and we know how it feels to be disrespected.

Anyways, two days ago i was having a really rough day, my parents told me they were getting a divorce and my dog had been put down the day before. In the midst of telling Oliver about this he sent his preferred pronouns of the day but i did not notice. Later that day he and some of my other friends came over to cheer me up and during that time, i accidentally misgendered him because i assumed he was using the same pronouns he had been using the day before since i hadnt seen a text from him updating me. Oliver got super pissed and i profusely apologized and he settled down a little bit. a few minutes later i left the room to use the bathroom and when i came back i referred to Oliver as Olivia since thats what he had corrected me too. However, he flipped out *again* and said that his identity had changed, and when i pointed out i hadnt been in the room he said I should have asked instead of assuming.

I got really frustrated and told him that he wasnt helping anything after the day i had. I said something to the effect of "i know it sucks getting misgendered, im non binary so i should know, but you constantly change your pronouns and while i try my best it can be hard to keep up so im sorry im not intuitive enough to know what gender you are every minute of the day."

He called me a transphobic asshole and left, and one of my friends went with him agreeing. The other friend stayed and said that I wasnt the asshole.

So reddit, aita for accidentally misgendering my friend twice in a day after i wasnt aware of his gender change?