Most Helpful Guy
Talk to your crush. Ask him who he loves? If he loves your best friend then its good for her. But if he loves someone else then tell your best friend about it so that you and she can both move on. It will hurt him but Sometimes you have to take some decisions that will hurt someone but it is necessary so as to simplify your and others life.
Most Helpful Girl
You get over your crush, maybe get out there and find someone new. You don't have to go on group dates with them. Even though your covering for them that doesn't mean you have to be there 100% of the time.