How to fix yourself before your issues destroy your relationship?

My boyfriend feels neglected and we argued a lot which he hates, he feels that I don't care about him and want to stay as I am. We tried to fix it many times but we still had problems, now he is giving up on me and is close to leaving me. After trying many times, I don't know how to show him an improvement which he will believe. I tried very hard to change myself for the better, not just for him but for myself.
How to fix yourself before your issues destroy your relationship?
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