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Honestly, it's something Regulus would hold over Sirius' head for the rest of his life. He wasn't there to see the aftermath, to see Remus so incredibly heartbroken because he thought he could trust him with his biggest secret. He wasn't there to see the bed rotting depression Remus was in for the days following after. And it will always affect how Regulus treats Sirius.
Because Regulus was there, he was the one who had to be what Remus needed and tell him that their friendship could be mended and that it was probably an accident that Sirius didn't mean it. Even though Regulus didn't believe what he was saying.
So now that they are out of the danger zone, he is definitely petty. Whenever they have a bad argument, Regulus will throw it in Sirius' face for an instant win, not caring if it was a low blow.
The constant reminder actually helps Sirius grow because it is a constant reminder thrown in his face of what he doesn't want to be anymore and a reminder of the person he wants to work towards to become. Yes, somedays this tactic makes him feel worse rather than better, guilt almost consuming him. But overall, it's making him a better person.
Idk if this has been round tumblr yet, but how do we think Regulus would react to finding out about the "prank" that Sirius pulled on Remus in fifth year.
Already dating moonwater.
Remus is going to Regulus as soon as he can walk again, sobbing the hardest he ever has, inconsolable really. He has to get talked down from multiple panic attacks before he can even get a rough explanation out of what James had told him had happened, who at the time was shaking so badly from poorly concealed rage at Sirius.
But Sirius better count his days. If he isn't already disowned by now, he will be shortly because Regulus will stop at nothing to make his life a living hell until Remus and Sirius have made up on their own terms. He is beyond livid and manages to turn most of the school against Sirius when they don't even know what happened (like Harry's 4th year but worse)