...What is love exactly...?

I'm starting to question what exactly love is. Is love when you take good care of someone? Or maybe have this heartthrob sensation for someone? I'm not sure anymore... Love...what does it mean? I know for a fact that you can't say you love someone if you can't prove it. I mean how do you know if someone loves you or not? They can't just say it like its nothing, right? Ugh, I'm so confused. I don't know what.love is between two people. I've never dated anyone before, but I'm not going to anytime soon. All I wanna know is what it means. Oh my goodness I need to get my head straight. Also, I should start thinking about what to say to others so I won't hurt their feelings and not talk about myself a lot, it'd be better that way.