It feels like a large percentage of the world’s creative arts (literature, music, painting, sculpture) have tried to answer that question, and expect they will continue to do so.
The reality is that it is a subjective experience so love for me may not necessarily feel like love for you. It can also change over time, hopefully growing, sometimes withering. It can be joyous, comforting, frustrating, painful - all things, and sometimes many things at once.
I don’t think I have a better answer I’m afraid!