Is this something I should apologise for?

Hey guys!
So I’ll try to make this as short as possible but still give context.

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I got Covid and needed to isolate from easter monday on. My kind-of-fwb which I spent the easter weekend with (and who said he wanted to come over for something when he’s back on his bigger car which would’ve been after easter) texted me every day for 5 or 6 days straight and also called me, which is not the usual amount of communication we have.

He asked every day how I am, and last friday he’s sent me pictures of something, told me about his day and said (in different words but still) he wants to see me as soon as I am out of isolation. I was negative again on sunday, sent him that and he just “reacted” with a thumbs up.

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Thought he’s busy and waited until tuesday to contact him again. Asked him if he’s available, to which he just drily responded “this week this is not possible I’m afraid”. I thought not answering to this might come over as unpolite or whatever, and asked if it is ok to ask again next week and mentioned he has forgotten something at my place he might need sooner or later. I did not get an answer at all, but he read it.

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He knows I’m dealing with mental health stuff and family drama/stress etc. After some time passed now I think I might need to apologise. But I am not sure this would be right social skill wise? Is this even something where it is socially expected to apologise for?
Like texting “I think I owe you an apology. I had too much time to ponder in the last two weeks which made me not think clearly, and combined with the pressure at home this made me unrelaxed so things like my last message happen. I know this should not happen, but it did and I feel horrible for it”

Any opinions on this?