My Theory of Types

I have various theories of types of things.
For instance, types of loneliness. I do not do the thorough classification, but I tend to discern people by these types. Whether he becomes needy for someone to come and be with him or he goes and throws himself to the company of random people. Or whether he is the one to do the same for the person who is lonely: come to his place at any time or invite him to a party.
Anyhow, now I have another theory. It can be called the theory of types of love, but I think that love differs from a person to person not only in type, but also in strength.
Do you love a person who loves you equally?
It does not mean that somebody is limited in the strength of his love and in the way he can be loved back. It's between people mostly. I guess, you got to find a person who loves you equally and by the same type of love for the relationship to be OK. But you can also find a person who will love you back the way you do, while you love with all your heart. Then you can achieve happiness.
But that's just a theory.