
What manga is this Chapter 1 page 4-5

They're from this one :)
http://www.mangago.zone/read-manga/scratch_blue/

I read this manga a couple times but i still don't get Chapter 5 page 180-181

From my understanding, the stronger an individual's feeling for someone the stronger their pheromones. So basically those two idiots like each other so much their scent got too strong for their current medicine to repress. It's also the reason why the uke asked the seme if he smelled anything when they were fighting, presumely because if the seme hated/didn't like the uke anymore he wouldn't be able to smell anything/the pheromones wouldn't affect him.

hate that bastard constantly cheating on him!
You took him for granted but when he's gone you started seek him but he doesn't want you anymore cuz someone give him what he needs ''Love & Loyalty'' which u didn't give. You took his love for granted. Always appreciate that in front of you cuz once it's gone u will regret it that u didn't take the time to cherish it.
Love it