Judging from FB pics and posts there, she and her husband seemed to live a kind of fast life -- probably normal for young people like them, fast to me.
I don't know if he is the jealous sort, but there are a lot of guys (and girls) posting on FB of their deep and intense love for Cassie (before she was found). There are also some pictures on her FB that may seem a little...on the edge, for lack of a better word. There are also pictures of him looking totally blotto.
The bar, and the bar scene, seemed to be a big part of their lives. (Not being judgemental, just stating facts, based on the pictures they posted, tweets, etc.)
She seemed like someone outgoing, that people gravitated towards. He seemed less so. Jealousy and alcohol can be a lethal combination.