Here's an idea: in "energy work", we sometimes talk about how the energy (qi, whatever) flows through but does not come from the practitioner. The practitioner acts as a focus, a lens, a mirror even perhaps, but not a source.
Now, what if we apply this idea to love? What I do not give love, but merely act as a lens, a mirror, redirecting the love I receive?
Then to love, I must let love in, fully accept it, believe myself worthy of it; for if I block the incident love, there is no refracted or focused or reflected love going out.