I’ve been thinking about Eva and how she hates all of her family’s significant others that are lower class and I wonder if the girlfriend Eva had in college was also lower class and somebody told Eva they shouldn’t be together because of that and that’s why Eva is so bitter towards lucia/renata/juls. Or maybe the girlfriend was really just trying to get Eva’s money so she is still holding a grudge and can’t trust anyone

Hmm, definitely a chance of that. Personally, I think she took all the wrong lessons from Leon banging on about the family and reputation but there is certainly some extreme resentment. Though as @dealanexmachina pointed out, her instincts regarding Lucia are actually correct. If she’s just transferring those same feelings to Renata and Juls AND there was something in the past, it’d make even more sense.