len seems pretty confident with his relationship status with kahoko until he witnessed kahoko get kabedon-ed by his fiercest rival. also, yunoki teased about kahoryo and him being far away in vienna. considering everyone chased after kaho's love and him deluded by kaho stories about her life with other boys, i think it's a cue for len to gave up and fleed to vienna.
i just hope in the next chapter, ryou will show his support openly with len. i mean, ryou's already giving up his pursuit anyway. len needs an ally, for real. boy doesn't know how to navigate his pining, so having ryou as his relationship counselor might help him to express his insecurities/wishes/feelings much better to kaho.