any advice would help .. :(

I just got out of a 3 year relashionship. It was basically mutual. We decided on a "break" but it feels like it's over.I've been trying not to think about it, it just happened yesterday. Today I was on my phone and I realized his Instagram was still logged into my phone. I went to log it out but before I did, I saw a DM convo. As soon as we broke up, he followed and DMs his ex. I feel really crappy because i don't know how to feel except hurt. What's sort of weird though is that he still has 2 photos of us on his IG. And his bio still has my name in it. What do you ladies think? I know I shouldn't be lurking, but I still felt like after our break from each other, we could find our way back... but after this. I don't know anymore :(