In any regard, there’s always a little hope no matter how small. Don’t read into this, he saw the photo and maybe he didn’t like the reminder of you and he realised he didn’t need your mum on IG anymore. If he was the dumper the rule is wait for him to reach out, but if you’re at the stage where you’re feeling strong and fine without him then sure there’s no harm in reaching out🤷‍♂️ if you could take him or continue on without him. But if you’re serious about getting him back stay in NC, let him come back if he wants to work on it. Message him, analyse his reaction if you want. Definitely don’t read into this though.