I'm not saying in any way that I am right and you are wrong, I just see this entirely differently:
1. You lost the chance to evaluate fully his conduct after sex. Would he have had the emotional intelligence and consideration to message you promptly? Or would he ignored you due to post-nut clarity and a base, disrespectful and unappreciative character? You'll never know now
Why am I 'evaluating his conduct after sex'? I don't feel like I've given him something special that he needs to show appreciation for. I've had, hopefully, a mutually enjoyable experience that I may or may not want to repeat. Why is it only his emotional intelligence at issue? I always conduct my relationships based on treating people how I would like to be treated, which to me means being honest and open and communicative. He can be rude and dismissive at any point and then I'll bin him. Doesn't matter if it's after sex or at any other time.
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2. You've offered him a second sex session on a plate. Men of low character will have sex with women they consider to be ugly, boring, and unlikeable. Some men will even have sex with women they hate! The fact he responds positively to your message is not a sign things are going well, or that he likes and respects you. It just means you're there and offering sex.
Nope. I don't think I'd be offering anything on a plate - just communicating how I feel and what I think. I could change my mind about that at any time. He could just as easily text me immediately saying it was great and he wants to see me again - and still just be using me for sex. If that's what he wants to do, why wouldn't he lie to make sure he gets it?
3. You have implicitly communicated to him that you are happy for him to be passive in the new relationship. You will offer further intimacy without any courtship or effort on his part.
I don't really believe in courtship and chivalry and expecting men to take the lead. I just communicate honestly and hope they do the same. I would hope that I have implicitly communicated that I don't mess around, know what I want and like him. Why not?