Business cards for our waitress... Right or wrong

So my fiance and I have been together for a couple years we went out to dinner the other night to celebrate our 2 year anniversary. My fiance is typically an ass hole that's just kind of his personality but whatever he's a dude lol. Our waitress was very nice and attractive and noticed he was being a little nicer then usual, the tone of his voice was a little different when he spoke to her just little things I noticed like that. He's a car salesman, so at the end of the night he left his business card for her. He's never done that before at least not when we've gone out to dinner together. Things have been a little tough between us lately financially so we fight more often then we used to. So I asked him if he thought that leaving his business card for our waitress might give off the wrong signal.. Like maybe he was hitting on her.. Do you think I have anything to be suspicious about or was this just something innocent.