The weirdest thing, but am I reading into it

Me and my ex have not spoken in a few months and never had a breakup talk as couples do when they split, the conversations simply stopped. Two weeks ago, after not speaking for a month and half, we finally did have a talk over message about where we stand. He told me why he couldn’t be in a relationship at the moment even though he wanted to be with me. I understand his reasons but still explained in the message I sent back that I couldn’t wait for him. I still wished him well and hoped he would reach his goals. I thought the text was very kind considering his rude way of ending such a long relationship (basically ghosting) but still I didn’t expect him to return it. He has his read receipts on and for two weeks, the message stayed unread. This leads me to believe that he left it in his message inbox for that entire time, instead of simply deleting the thread and calling it a day, or reading it right after I sent it and then deleting it. The weird thing happened last night. I was posting stories to my Instagram. He watched a few and then stopped and didn’t watch the rest. But then on a whim I decided to check the status of my last message to him. And to my surprise it said “read” at whatever time it was last night when I checked. There is still no response this morning, it still says read. And when I checked my stories, he had watched the rest. So I am just so confused now. I was doing so well and now I feel so hurt again like everything is fresh as if it just happened. I don’t know why someone would leave a message in their inbox for two weeks and then read it when they could have just either responded politely or read it much earlier and put an end to this. I feel like he’s playing mind games, or maybe he thinks it’s been enough time that he can finally read my message and remove it. Either way I’m so hurt now thinking he had it there the entire time, couldn’t be bothered to say anything nice back despite sharing and making so many memories together, and then randomly read it in the middle of watching my stories. Part of me wonders if the particular stories I was posting (having fun with my friends, etc) made him jealous and that’s why he decided to be spiteful. Either way I’m lost and not sure what to make of this or if there is anything to make of it at all. All I know is it set me back in my healing a lot and now I feel just as hurt as I did in the beginning.