What is the mean of LOVE?

It is usual to use to word love almost in everything you like, for example, -I love chocolates!, or I love ice cream!.However, what is meant by ‘love’ differs from case to case. The Greeks philosophers came up with three different view of love: eros, agape, and philia.
Eros is originally meant love in the sense of a kind of passionate desire for an object, typically sexual passion. Agape the sort of love God has for us persons, as well as our love for God and, by extension, of our love for each other,a kind of brotherly love. Philia means a kind of affectionate regard or friendly feeling towards not just one's friends but also possibly towards family members, business partners, and one's country at large. The question is even though there are different ways of defining love, how can we measure it? If love is something that we can't see does that means that it does not exist? And also What feeling do you think is stronger, Love or hate?