Why is my ex boyfriend obsessed with me?

My ex treated me horribly in our 2 year relationship and couldn’t stay loyal. I gave him many chances to change and it took 2 years of manipulation and gas lighting for me to finally walk away. He cheated on me on NYE and I’d had enough. I decided to go no contact ever since but he will NOT stop calling me off of No caller id and friends phones. Keeps messaging me on every social media platform he can think of. I keep blocking him but he won’t stop. He’s being really obsessive and told me he was going to show up to my apartment and send flowers. Why is he doing this? He was horrible to me but will never let me go. Can someone help explain?

Why is my ex boyfriend obsessed with me?
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