First, "I'm not flirting with anyone since I don't have feelings for anyone" makes no sort of fucking sense. Completely illogical.
Secondly, even if was not a stupid attempt at justification : "I don't have feelings for anyone" is a dumbass thing to say to the person who has been protecting and hosting you for months, is in love with you, and is currently having a jealousy outburst.
So, yeah, good job mate, you managed to critically fumble twice in the same sentence. Go MC !
And all he had to say was "Oh, no I'm not flirting, you know I only have eyes for you." But obviously that's beyond the strength of any shonen MC…
Also, I guess this chapter is the source for the cover of volume 11, meaning this chapter is badly categorised and should not be filled as part of volume 10.
edit: yeah I checked bookwalker and volume 10 contains chapter 49-53, volume 11 has 54-58.