Love at first sight...
Doesn't exist, obviously. Love is much more than an emotion. It is a connection. A connection which cannot exist unless it is mutual.
Unrequited love is different thing all together. Synonymous no doubt, but it is a different thing, and it feels different.
Is complete infatuation possible on first sight? Hell yeah haha, I am a victim of it all the time.
I see a pretty girl with an interesting haircut and a face full of metal and I am

________

while I follow her around like a love sick puppy haha. But that isn't love. It's just strong attraction.
I will say that strong feelings early in relationships can
feel like love. It is similar probably the same emotion you feel when you do love someone. But it's just not mature, it's different when you've been dating someone for 7 or so months and you wake up, and you get up to make them a breakfast already knowing everything they want. You wake them up and chat and you already know what they're gonna say and stuff. You
know them like you know your family members and stuff. That is love.
Not love hearts for eyes while you stare across a room.