By having your own special interests and diligently keeping up with them. Do not allow this man to replace them (as much as you might want him to). If you keep feeling like this when you see him. Then it could be love. But if you would rather do your SI than see him, maybe it isn't.
I found myself wanting to share my SI's with him...to share his with him as well. Some of our SI's overlapped and this is where the real fun began. We both love furniture shopping and planning, we both love books and fantasy, myths, poetry, music, movies, technology, staying in, playing board games, cooking, cars,....wow, you know something? I never realized how much we really DO have in common until I was actually listing them here.
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My whole life has been an exercise in original thinking. While I was looking in vain for the answers in books, I found them within myself.