My friend accepted my request, then deleted me a few days later. Why?

A guy friend of mine and I are usually really close and enjoy each others company.
We engage in a lot of banter, but he is in a relationship so it never is anything serious.

Because I hadn't seen him in a while, I decided to add him on socials.

He accepted. A few days later an incident between the two of us occurred for which I reached out and apologised. Things seemed to be alright afterwards, so I made a joke and that was it. He deleted me the day after.

I don't expect any of you to know why he would unfriend me, but if this would have been you in this scenario: what would make you delete someone you usually get along with really well?
My friend accepted my request, then deleted me a few days later. Why?
Hurt by the joke after the incident, so wouldn't want to be in contact again.
girlfriend noticed you texted and she didn't want me to reach out
It would be inappropriate to text with a female and so I delete them
It makes me feel like you added me only to talk privately and I am not interested in that
I want to keep my private life private, even if we get along
There is no real reason I would delete you, because social media isn't that serious. I would have just let it be.
Anything else (see comments)
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My friend accepted my request, then deleted me a few days later. Why?
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