>>2 I'm pretty much the same, though I'm harsh to people I don't like as well as my friends. But when I really like someone, the snarkiness never stops.
But I think the best way to show you love someone, romantically or not, is to care. I don't mean watch their every movement for signs of negative emotions so you can lick their wounds for them - I mean that you're there when they need you, and when they don't? Keep out of the way. Because they shouldn't have to depend on you and you shouldn't have to depend on them.
As long as you're there when it matters most.
Hahaha that was bullshit. Just let them know that you actually give a shit about their existence and hope they feel the same. Be open about it but don't be a clingy little shit.
Summary: don't be a dick and you'll be fine.