How do I regain his respect?

My ex and I were together for a year. We broke up and for a week after I asked him if we could talk, for closure. He refused. I let it go and we did not speak for 5 weeks. Then he texted me saying he wanted to meet and talk.

I did worst possible thing. I showed up at his house at 2am and we had sex. We barely spoke. We spoke very briefly the next day on the phone and it was awkward and haven't spoken since. He texted me a few days later saying that we still need to have a talk soon. I haven't responded.

How can I regain his respect?
How do I regain his respect?
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