Sending SHIRTLESS SNAPS?

So I was snapchatting one of my guy friends, and I sent him a picture of me tanning in my bathing suit (nothing too sexual). In return he sent me a snap of him shirtless. Guys, will you send shirtless snaps to any girl, or do you usually do it to be flirty with girls you like? I've been friends with this guy for awhile and this is the first time he's done this, so I'm trying to figure out if he's starting to like me or something?
Sending SHIRTLESS SNAPS?
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