How do I show my Ex-Boyfriend that I’ve changed?

I broke up with my boyfriend awhile ago and I feel so fucking awful because of it, I felt so bad. But he gave me a chance after he calmed down and told me he’d be friends with me for now and this will be my time to show him that I can be better than I was before.

Basically what happened was that I didn’t make little to no effort and I kept getting jealous and that problems kept arising from us, im overreactive and selfish with him. I’m terrible at committing to a relationship and I wanna show him that I can be a good girlfriend and not some hoe who uses him.
Please listen to me and tell me how I can make this up to him! I want him back and I want him badly! He’s better than the rest of my ex’s who didn’t care about me. None of us cheated.
I wanna show him I can change
How do I show my Ex-Boyfriend that I’ve changed?
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