ML and FL are close.  Before he gets the chance to confess, the FL starts dating the SML who she likes. This hurts the ML so he distants himself from the FL and acts cold towards her. She doesn't understand why (because she doesn't know he likes her). The ML starts getting close to the SFL to try and forget the FL and that begins to annoy the FL and make her jealous. Eventually she realizes she loves the ML and breaks it off with the SML and tries to win the ML back and succeeds.