What does it actually mean when a guy says to me “I’m inlove with you lowkey” why did he say lowkey?

That means he likes you, but not enough to date or commit to you yet-
Geez, why do people have to play word games with others nowadays? Just say if you like someone or not, lol. So he likes you, but he's not fully in love with you- enough to be with you that is. That's what I got from it. In other words, he's not serious about you (yet).
It probably means that he loves having sex with you but is not planning to commit to an exclusive relationship. He's not at a point in his life where he is thinking about settling down.
So the "love" thing was a noncommittal word game to string you along.
It means that you misheard. It was actually "I'm in love with you, Loki". He thinks you're the Norse god of chaos.
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I’d tell that joker goodbye. You’re either in love with someone or not. 👋🏽✌🏾
Probably platonic confession
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