How to show him I can change?

He dumped me bc i was jealous and insecure. I was asking a lot of questions like 'Who are you texting' 'Why did you come home so late today' I didn't forbid him to do anything but he said i smothered him with my behaviour. He dumped me through text and i can't live anymore. I want him back but he said he only wants his peace of mind and to never contact him alone. I must mention that our relationship of 1 year Was a real rollercoaster. He has broken up with me several times, i begged to take me back. But this time is different. How to fix that? My behaviour has totally drove him mad

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8 mo
Guys i wanna add something. He wasn't the perfect boyfriend as it might seem. For example, the first time he broke up with me was when i was in the ER for endometriosis. He texted other female friends good morning texts. During our fight, he stormed out of car while i was driving with him and his dad
How to show him I can change?
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