You DO NOT do bonding rituals when in an NSA relationship. His behaviour in the morning was to keep it so that you don't catch feelings for him.
No bonding rituals
No gift giving
No hanging out after sex
No cuddling on the couch and talking about personal stuff which leads to vulnerability which then leads to feelins
No texting "how was your day" small talk. Just "lets get together" type messages which implies to you both that its for more sex and nothing more.
If you think you actually want to pull this off without getting hurt then don't expect anything other then sex. You'd do well to get up and get dressed afterward and leave. Even if he tells you to stay because it won't mean he wants you for a gf it will just mean he might want more later.
That is why he was distant. You both accomplished NSA sex and he wants to keep it NSA. He's told you in words and now in his actions so believe him.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion