Excuses to see the other person again

When is a cigar just a cigar, a kiss just a kiss, or leaving or lending stuff just what it is?

In the movie X-men, Logan leaves his dog tags with Rogue and tells her that this is how you'll know for sure that we'll meet again.

There is definitely a language communicated through inanimate objects. People give and receive flowers, a plush animal, flowers, and even the color of the roses signify something. But what I'm curious about is how often people purposely leave stuff behind or lend stuff to another person. I've done that quite a lot of times myself: leave stuff with the "I'll definitely see you again sometime" intention. In fact, that's my weird way of showing that I like someone: they'll have a hefty amount of stuff that actually belongs to me. Of course, that intention gets lost in the shuffle of plain wanting to be hospitable at the same time. I can lend a book because I really want them to read it. So the language of leaving stuff behind is actually becoming increasingly more complex than I orginally thought. I mean, I could leave food behind, lend food on a regular basis and it doesn't mean much. Maybe it does.

But the big underlying question is whether the person is attracted or not. At that point, so what if they leave their scarf, or forget their hat; there's no more uncertainty of seeing the person again, so leaving and lending doesn't have a huge statement.