I can't let go of my ex?

I. Really struggling to let go of my ex. I really really miss her. I wake up and the first I think of is her, and the last thing at night. I'm still in love with er, it's been 5 months since we broke up but I can't stop thinking about her.
I get really bad anxiety just thinking about her and the loss. She doesn't seem that bothered, she lost interest while with me so i think she was overrme ages ago.
she occasionally messages me with links to things, then completely ignores me again when I reply. Really weird and I don't get why. Then she posts all over social media looking and sounding really happy.
I can't let go of my ex?
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