The adult side, however, the side that had been slighted and hurt felt differently. Regulus was ready to keep his walls up. From Sirius leaving to how he treated you...Regulus would keep an eye on him constantly if he had to. Regulus would be stubborn if he had to and he didn’t care to admit it. If it kept his family, meaning Abby and yourself, safe then Regulus would be ready to fight in an instant.