why would my ex hit me up again over old nonsense??

So my ex and I (18) we started talking last April and started dating in July but he turned out to be an egotistical narcissist who just wanted to use me and gave me so many mixed signals resulting in us fighting a lot and breaking up in September. We go to the same college so it was awk and I was very hurt. I slowly tried to move on and he claimed anyone I tried to move on I was only doing it Bc I was still in love with him??? Which wasn’t the case. The last time I physically saw and spoke to him was November because he decided we needed to do no contact. He used to try to convince me that it was a right love wrong time type of situation 🙄🙄

Then we went home for the holidays and on break I was swiping on tinder and such and I came across his friend Frankie. We matched and had a friendly conversation and he wanted to meetup with me but after thinking I thought it was too weird. This was in December and it quickly fizzled nothing ever happened.

Then in January my ex readds me on social media and texts me the day before the spring semester (Jan) asking if I was staying home but that was it. Then he sent me a pretty sarcastic and immature birthday text in April which I didn’t really need.

Now it’s June and he texted me the other night asking if I had talked to his friend Frankie. No hello or anything so aggressive and nosy and out of the blue for no reason?? Like I can talk to whoever I damn please but that was over 6 months ago so why is he bringing it up now??? I had also matched with his friend Billy on tinder last month and he seemed cute but nothing ever happened with that which I didn’t really expect it to since he just wanted to fuck but I didn’t. We never met up either and my ex didn’t bring up his name so maybe he doesn’t know??

***i only met his friends once while we were dating but there were so many people there I don’t remember if they specifically were there I’ve never met up with either of them*** (I only know they’re friends Bc they had a picture of them together on their profile)

And he literally became best friends with my ex roommate so if he has a problem with me talking to his friends he can go fuck himself Bc I’ll talk to whoever I want 😋😋

Lately I’ve been doing my own thing feeling more confident and happier than ever and didn’t even bother answering his stupid text. I know his birthday is coming up but I’m not gonna acknowledge it. I post whatever I want and he still views my stuff.

I do still follow his Spotify Bc he’s got good taste and when he sent me that text apparently he was listening to his “getting plastered” playlist which was just weird to me because he never ever drunk texted me at all during or after our relationship, if anything I was the only one initiating the conversations during our relationship and now that we’re broken up he’s the one who’s been initiating them altho there hasn’t been many. So why does he still seem like the one obsessed meanwhile he thinks that I was the one obsessed??🤣

I’m just generally curious why he would even bother reaching out to me about that especially when it was so long ago? Like to start a fight? Jealousy? Mercury retrograde? He misses me? Wants me to have him on my mind still?? Like what is this dude’s thought process and what is he looking to get out of this because I genuinely do not know 🤣🤣🤣