Iphone nuances and my ex

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>Got really depressed
>Break up with girlfriend whom I love because I don't want to bring her down
>Month later I hit lower than rock bottom and get a second wind
>Build myself right back up and feeling more confident than ever
>Trying to get back together with ex
>She's still hurt
>Struggling to get through to her
>Says she wants to move on and that she is happier
>Don't believe she's being sincere because we've been together for years and we broke up still admitting love for each other
>Had a long string of messages other night after month 2 of trying to win her back before she goes back to school
>"All I've ever wanted is for you to be happy."
>Fastforward 5 days of no contact
>last message I sent still labeled "delivered"
>We always kept read receipts on even through break up
>Check message string tonight, the read receipt appeared
>It's dated as the same night I sent it to her

Did IOS just fuck up on me and lag for a week, or did she turn off read receipts and then turn them on or something?
Am I overthinking this?