There's more than meets the eye in the case of Caitlin Lowe, but the fact she's obnoxious and predatory is just the tip of the iceberg. That's without even stating she's also irrational, egocentric and uncaring, but at least they only show in smaller doses and mixed with behaviors of being sentimental as well.
But focus on her as this is what she's notorious. Any healthy relationship is made incredibly difficult because of this and her coldness, much to the annoyance of others.

Fair is fair though, Caitlin isn't completely rotten. She's aspiring and innovative in good amounts, there is still some hope yet.
Unfortunately, her predatory nature will forever be something to deal with.