When love first happens, the individuals are giving each other energy unconsciously and both people feel buoyant and elated. That's the incredible high we call being 'in love.' Unfortunately, once they expect this feeling to come from another person, they cut themselves off from the energy in the universe and begin to rely even more on the energy from each other--only now there doesn't seem to be enough and so they stop giving each other energy and fall back into their dramas in an attempt to control each other and force the other's energy their way.