I'm still obsessed with my crush
What is it about your crush that is causing you to obsess?
Yes, I know that's cliche but I keep thinking about it.
I'm sorry they broke up with you, but you shouldn't keep obsessing over them since it's all over. It's not a good feeling to always mull over the possibilities, because you will be missing the chance to get someone better in the present.
Well I'm always going to have those bitter feels, but I'm fine with it.
It may be helpful to try and either met other people, or occupy your time more. Maybe engaging in an exercise routine, a diet, or simply a new hobby will allow you to focus less on your previous partner so you can move on.