Shounen is a goddamn MARINE on the Battlefield of Romance! He plans out and prepares a major Christmas operation only to see his plans start to crumble and then falls victim to biological warfare, yet he still sees a fleeting opportunity to take his objective and makes a decisive move! Only to be sniped by the bullet of adult sensibility!
I salute this young warrior and have faith that his valor will eventually be rewarded.
Now this is a good way to handle a failed confession. No fireworks and people losing nerve and giving up. He struggled through, but she stopped him and left - but in a lewd and ambiguous manner, leaving the will they won't they intact (since that's usually the preferred state, for easy storytelling).
Clear progress as well. Now he just needs to pick himself up and try twice as hard XD