I think we all have two groups of friends no? One consist of friends you are extremely close to, bff type of friends. These are usually one you cries to, knows your deepest darkest secrets, trust with your life, ect. The other are friends from work or school, you may be close, going out to dinner and occasionally on trips but not so so close where you know everything about one another. I can understand because i have those type of friends. There are people from my old job that i knew for well over 5-6 years, we are close but they arent so close that i tell them all about my business. One became my bff but the rest are more "good friends".
With that said, i think maybe they have an idea of who she's seeing but Matt probably doesnt talk to them about it much. Or i want to think of it as Matt not wanting them to get involved and end up like the Nang Fah gang. I mean she did say that she told the elders cus she knew there would be drama. Imagine if Matt or the Furbies said they knew all along, oh em gee they would had gotten strawberries thrown at them too like Mint. I mean they are got some prior to her prss conference and that was just people assuming they knew