Why do I get upset because of my ex and his new girlfriend?

I honestly don’t understand, despite the fact my ex practically broke my heart, stood on it and everything else. I still cannot get over the fact he’s with someone new. They started to date straight after me and him split (I’m 99% sure he didn’t cheat) and since then the thought of them being together can’t get out of my head. It’s been a good 2 months now and I just want to be able to completely move on. I know he’s no good for me and I 100% want to commit to my education at this moment of time so it’s not like I want to be with him. Whenever I catch myself stalking his social media thinking I’ve moved on and that it’ll be okay- I end up crying my eyes out. What do any of you suggest I do? Will this somewhat jealousy soon wear away?
Why do I get upset because of my ex and his new girlfriend?
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