You should never put in 1 female Betta with a male. Male Bettas need atleast 3-4 females in a 10g+ tank with plenty of hiding places for the females. MAles are solitary fish so don't worry about him getting lonely, he will be happy alone as he is now.
 
  glad he's a happy boy  
  He spent along time being scared of his own shadow but is getting much braver now  
 