Listen, anyone who spends more than 20% of their time talking about one person is clearly more than a bit off their rocker. Considering how much Zoe speaks about Ezreal I wouldn't touch that kinda crazy with a 50 ft long stick.
Regardless, I don't deny that Lux may or may not have feelings for Ezreal, just like how Zoe all too clearly does. Doesn't mean Ezreal cares in return.
Notice your two points, "stealing Ezreal from Lux" implying a possessive sense from Lux's end, not Ezreals. As well as "She hates Lux for having Ezreal" which is clearly referencing the arranged casual set in place by their respective guardians, and is not an indication of feelings.
Taric and Ezreal's feelings for each other clearly run beyond such superficial bonds. Now begone lady of luminosity, in this bedroom we like the lights off.