i think when you first go out with someone, there will probably be alot of initial passion etc...but love is what's left after that initial excitement fades...ie do you still care deeply for them or have they become 'redundant' to you just because they aren't a new thing in your life anymore?
i duno i've been with my gf about a year and a half...and i think it's just that feeling when ure with em, u kno everything will be ok...when ure not with them, u always wish u were, if u go out without them, u wish they were with u...
love cant be described, but best shown by how ppl feel in different situations...