[@Lmpkio] Judging from this one reaction I would say that Marlene is not like Juvia. Yes Juvia is obsessive and easily made jealous, but she makes it a point not to attack guildmates. And really unless someone truly threatens her love's life she will not attack someone with maiming or deadly intent. When faced with jealousy she would attempt to woo or one up the competition. 

No, Marlene is schichotic.