The old cliché about gay men being promiscuous and unfaithful is alive and well, I see.
What? To my knowledge he was mixing up the memories of his current partner with his ex.
Do we know for a fact that he has an ex named Henry? Because there's an "I almost talked about my ex" type of reaction and an "I almost revealed I had an affair" type of reaction and this looks to me like the latter. The face you make when what you almost said could have lead to a breakup.
How is this YuruYuri?
I can't talk for the original poster but I believe the meaning is that in 10 years most of these couples will still be at the stage of slowly getting closer.
I think the implication is that Nononon chickened out at the last moment and pulled back right before their lips would have touched.
If that's what happened, the kiss sound effect is all wrong. I've never heard of a manga using it ("chu" or whatever) for a failed kiss attempt that didn't land.
Nononon doesn't strike me as the type of girl who has the reflex of pulling away from a kiss from her crush. More like the type who mindblanks when she sees the face of her crush feeling her visual field and can't react for sh*t no matter what happens.