Why am I dwelling so much?

Why do I care so much about my ex, who doesn’t give one single fu*k about me? I’m constantly checking to see when he’s active on social media even though we don’t talk at all, I’m constantly thinking and wondering what he’s doing, I can’t erase our pictures. All while I’m informed all he’s doing is partying and having fun... while I’m sitting here dwelling over him and suffering. I think the worst part is I know I’m the reason our relationship came to a end so I feel selfish for feeling this way and hurting this badly over him.
Why am I dwelling so much?
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