There have been many questions about what love is, ranging from non-attachment and compassion. I am not looking for a clear definition of the opposite of love, i.e. what love isn't, but feel free to do so if you think it can help answer the question. Rather, I want to know if love can exist without suffering: in much the same way that happiness cannot exist without suffering. I don't mean to equate love with happiness but love does have an element of joy to it. So, to what extent is pain the opposite of love? Or, to what extent can pain be separated from love? Principle of non-duality answers this, but I want to hear other opinions.
Loving kindness(Metta) is a state of the mind that arises and vanishes. It's not something that exists. For loving kindness to arise, one should see the lovable nature of beings. It does not require suffering. On the other hand, compassion requires seeing the helplessness in those overwhelmed by suffering.
Happiness is also a state of mind that arises and vanishes. It does not require suffering. Happiness arises even in the minds of enlightened beings.
Far enemy of love is hatred/aversion. Near enemy of love is lust.