Is NOBODY wrong in the post ? POST : I’ve been afraid to post this and it’s a bit different since it’s me who thinks that I’m the asshole in this situation as others say (including my crush" that I wasn't the asshole

Context, this was about a month ago during a me spending winter recess with my mom, I was talking to my we’ll call “Turtle”, and Turtle knew that I like him as we've been close for 4 years and he's care so much as to not hurt me and loves me a lot but never made it official, he's a caring guys and always wants to help me with my problems.

During the break, I saw tweets from Turtle and this other girl we'll call "Lizard" and Turtle was saying  to her "goodnight darling" with heart emojis around it, thinking that this might be a joke I just tried passing it off as one until I saw the response and more heart emojis shown with lizard saying "goodnight, the one I love calls" my heart sank and I was figuring to tell him about it the next day as he was asleep by then, I had a heart time sleeping that night.

When I woke up I saw that he noticed me liking the tweets and he was annoyed saying "before you freak out, this is a FAKE relationship between us in order to make her feel better" not wanting to escalate the situation and making things worse I brushed it off and pretended that I did know such a thing and went along with my day, part of me really was mad at him and want to yell at him but I try not to think about iI.

So for the majority of the day I was in a bad mood and biting my tongue as I was beginning to break apart with my feelings being bottled up because I thought I lost him, and started crying to him about my past lovers and how awful life is for me, even though the real reason why I was so upset was because of him and Lizard, the floodgates opened when mentioned Lizard again and I had enough and told him how much it was burning me up on the inside as I saw his tweets with her and reading the bios of the two and I cried more and more.

I was scared shitless as I thought I was gonna fuck things up between us but Turtle found out about how I really felt after I told him how much pain I was in when he started fake dating Lizard, he first tried comforting me saying he won't make those tweets again but I pushed him away as I told him that it doesn't make the tweets automatically disappear, he then deleted all of the tweets between her and him and removed Lizard's name from his bio and vice versa then tried calming me down.

Turtle keeps on assuring me that he was in the wrong and how he wasn't thinking about me and glad that I told me because he cares about me and my mental health, but a part of me thinks that I should've said nothing and minded my own business

AITA??

TLDR; my crush started fake dating a woman and I ended it immediately after.