Today it is coming up in my mind about this particular topic, that since there isn't very much remaining --- Diogenes Laertius lists that Epicurus wrote a book "On Love" (we can only hope it is laying in waiting to be digitally read amongst the chard scrolls of Herculanium) --- and so we will need to gather all the scant evidence from the extant texts and make inferences about it.
Love and the "objects" of love (and with relevance to Valentine's Day since now marketing includes every kind of relationship).
- friends
- spouse (or life partner)
- family (children, parents, siblings, etc)
- lovers (modern times = "friends with benefits" and ancient times = "hetairai")
We have this section on the forum (which I will need to study):