Addison felt like he was in an "Expectations Vs. Reality" video.
But instead of living a glamourous life on the expectation side, he was stuck with the reality of things.
The reality isn't necessarily bad, it's just unexpected and extremely embarrassing.
Addison felt embarrassed at how nervous he suddenly felt around Oliver.
He felt like his 4th-grade self again when he and Oliver made things "official." During class, they'd sneak out of the classroom to hug by the water fountain.
Or when they'd beg their parents to drop them off early so they could sit together in the play yard before school.
Some things never change.
But now, instead of...