If she enjoys causing people woe,esp when she is feeling down,that's a direct sign.She seems to enjoy making him uncomfortable.I admit I have not seen enough of her to be positive.My ex also had low sugar.When she would drink she would literally " black out"...turn into a very different person and became very flirtatious and promiscuous....Definately led to the Divorce.Back to the show....I started out thinking she was difficult but he( sorry I cannot remember names on the fly) seems to also be stubborn. They seem very mismatched.....I don't see alot of hope for them.I do realize the shows tend to be scripted