Both oxytocin and dopamine at ideal levels are necessary to keep an emotional bond rewarding.
Your relationship is likely to suffer when dopamine levels bounce around.
Think of oxytocin and dopamine as the yin and yang of bonding and love... Ideal levels may also make mates more tolerant and likelier to accommodate each other. Stronger bonds, increased flexibility, and greater happiness are good reasons to master lovemaking that leaves you contented--but not finished/sated.
My comments: When we say love is a process, I think this sense of not being finished is inferred. But it also seems that vicious relationship cycles can occur, where we think "I'm not finished with YOU yet!" It's as if the dope is high but the oxy is low in such relations. CPA again:
Disharmony is very hard on us.
The amygdala...channels brain activity down to two paths, love or fear... It helps decide whether your relationship is safe or threatening...we would be wise to forgive errors as "just human".
The bottom line is that your rational brain is not in control once a spat triggers your amygdala.
The good news is... We can choose behaviours and thoughts that encourage the neurochemical responses we desire...choose the behaviours that release it naturally.