Ex's and Jealousy

It is the summer of 1977, and sixth year's done. Sirius is staying round Remus', but turns up in a way Remus didn't expect. But the next day, after he sort Sirius out, Remus' is reminded why he doesn't stay outside for so long. Ex's are never fun to have live over the road from you...especially when you're involved with someone else. So, what will Sirius do? How will Remus react?