Drew - he's probably not seeing all the dramatic mood swings that you are seeing. He would mostly just see her "happy" face. Remember, he's a distraction - so those negative aspects of whatever she's going through are not front and center when she's with him. And when she does show any negative emotions around him such as anger, she's probably blaming you.
"Let anyone who thinks he stands take heed lest he fall" 1 Cor. 10:12
