Is it possible to have a condition where you can fall in love for a temporary time then fall out of love?

Yes, but it's not called "falling in love". It's more like a sexual attraction (not sexual as in coitus, but more like feelings and sensations of pleasure and happiness, like when you get high). It's temporary because you like what you see at the moment, but then as you get to know them you figure out they are not the person for you