“My sister’s boyfriend’ll be like, ‘We know who the real third wheel is.'”

My sister’s boyfriend has a little brother. And he is best friends with my boyfriend. And their friendship is a little bit more than friendly a lot a bit of the time. Like, there’s jokes that everyone thinks that they’re dating, and it’s kind of a wreck and it makes me feel really awkward. So over the past couple days — my boyfriend completely lives here again — I saw a heart get added onto this other kid’s contact. And we were like at a thing together and he was texting him. He keeps bringing him up. And my boyfriend also stopped getting, like, defensive when people made jokes about them dating around me. Like he’s just totally cool with it now, and like my sister’s boyfriend’ll be like, “We know who the real third wheel is.” And, um, my boyfriend doesn’t deny it. He just lets me go on feeling like I’m a third wheel, which is so uncool. Like, what the heck! So now I’m like, “I don’t know what to do.”