Why would a guy discourage his guy friends from pursuing his best friend who is a girl?

Why would my best guy friend discourage his friends from pursuing me? He says they may try but he has told them not to bother or that they would be unsuccessful in their attempts. He has also told me that I can pursue them if I want but he would recommend not doing so. He has made it clear to me and everyone else we are just friends so why does he care if he isn’t interested?
Updates
+1 y
He also discourages me from going on dating sites
Why would a guy discourage his guy friends from pursuing his best friend who is a girl?
Post Opinion