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In omega verses omegas had a gland in their necks that alphas bite too mark them and that's the one that emit pheromones. He took it off because omegas can only be marked by one alpha in their lives, and since he got already marked and leave behind he took it off.

he got beaten by his ex then ex left him? idk abt this world but once omegas are marked they can’t live without the presence of that alpha. he went through surgery to remove the skin that has the mark and that caused him to have irregular heat. this is what i remembered from reading it yesterday lmao

nah I think they were chilling and then he suddenly left with no notice