She has an oscillating relationship with her boyfriend where they don't know how to deal with eachother's problems or reach common ground but still find each other irresistible.
I would definitely look into whether or not you prefer subjective sensing over objective sensing. One example I often encounter with people is, that Si users will think of the dirty dishes and all the possible things that could be going wrong (the mold is growing, the germs are multiplying, the roaches are scurrying on them at night) etc and the'll lose sleep until they satisfy their anxiety over the dishes. Whereas for myself, an objective sensor, i will walk into the kitchen, sniff the air and say, "hmm... *sniff sniff* smells like its time to do dishes."
This is a huge generalization but that's basically how it works for me.
Also IME, you can feel the difference between Fe and Fi. Fi feels like its internally warm, while Fe feels like its radiating. When I date Fi users, I feel loved in a way that fills my body much the way eating lunch warms me up in the cold. Whereas, when an Fe user loves me, I radiate energy outward. In both cases I become more compassionate but in different ways.