Personally I believe love exists. People could decide to express it towards others or not. The quote below is from eharmony website:

"The scientific study of love is still ongoing, as there hasn’t been any hard evidence to determine whether or not love is, in fact, real–or that it’s just made up and merely exists in our minds. But, what we can say is that when studies are conducted on these feelings of love, researchers do find that parts of our brain and its reward system are active."